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question_answer1)
Observe the given figure.
What is the angle of reflection?
A)
\[\text{2}0{}^\circ \] done
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B)
\[\text{4}0{}^\circ \] done
clear
C)
\[\text{7}0{}^\circ \] done
clear
D)
\[\text{9}0{}^\circ \] done
clear
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question_answer2)
An object O is placed in front of a plane mirror as shown below.
At which point is the image of the object 'O' formed?
A)
P done
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B)
Q done
clear
C)
R done
clear
D)
S done
clear
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question_answer3)
A ray of light travels from water to air as shown below.
Given that the refractive index of air is 1.0 and the refractive index of water is 1.3, what is the angle of incidence?
A)
\[\text{22}.\text{6}{}^\circ \] done
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B)
\[\text{23}.\text{1}{}^\circ \] done
clear
C)
\[\text{39}.0{}^\circ \] done
clear
D)
\[\text{4}0.\text{5}{}^\circ \] done
clear
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question_answer4)
The radius of curvature of a spherical mirror is 30 cm. What is its focal length?
A)
10 cm done
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B)
15 cm done
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C)
20 cm done
clear
D)
25 cm done
clear
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question_answer5)
A ray of light travels from air to glass as shown below.
Given that the refractive index of air is 1.0 and the refractive index of glass is 1.5, what is the angle of refraction?
A)
\[\text{22}.\text{6}{}^\circ \] done
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B)
\[\text{3}0.\text{8}{}^\circ \] done
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C)
\[\text{35}.\text{3}{}^\circ \] done
clear
D)
\[\text{4}0.0{}^\circ \] done
clear
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question_answer6)
Which of the following correctly represents the incident ray, the refracted ray and the emergent ray in the given glass slab?
A)
B)
C)
D)
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question_answer7)
A ray of light travels from water to air as shown below.
Given that the refractive index of air is 1.0, what is the refractive index of glass?
A)
1.2 done
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B)
1.3 done
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C)
1.4 done
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D)
1.5 done
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question_answer8)
A light ray travels through three media as shown below.
Which of the following shows the ascending order of their refractive indices?
A)
Medium 1, medium 2, medium 3 done
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B)
Medium 2, medium 3, medium 1 done
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C)
Medium 3, medium 1, medium 2 done
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D)
Medium 1, medium 3, medium 2 done
clear
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question_answer9)
Which of the following correctly shows how a light ray travels through a thick converging lens?
A)
P done
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B)
S done
clear
C)
Q done
clear
D)
R done
clear
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question_answer10)
Which of the emergent rays shown in the figure is the correct-one, when an incident ray strikes a diverging lens?
A)
P done
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B)
S done
clear
C)
R done
clear
D)
Q done
clear
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question_answer11)
What is focal length?
A)
The distance from the light source to the image done
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B)
The distance from the object to the centre of the lens done
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C)
The distance from the image to the centre of the lens done
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D)
The distance from the focal point to the centre of the lens done
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question_answer12)
Which of the following statements are
(i) The principal focus of a converging lens is real. |
(ii) The principal focus of a diverging lens is virtual. |
(iii) The principal focus of a lens always lies on the principal axis. |
A)
Only (i) and (ii) done
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B)
Only (ii) and (iii) done
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C)
Only (i) and (iii) done
clear
D)
(i), (ii) and (iii) done
clear
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question_answer13)
Which of the following statements are correct?
A)
The image distance obtained from a far away object is the focal length of the convex lens. done
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B)
The images obtained from a convex lens always lie on the focal point. done
clear
C)
The images obtained by a convex lens are always real. done
clear
D)
The images obtained by a convex lens are always inverted. done
clear
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question_answer14)
An object O is placed at the position shown in the given figure.
What are the characteristics of the image formed?
A)
Real, inverted and diminished done
clear
B)
Real, inverted and enlarged done
clear
C)
Virtual, inverted and diminished done
clear
D)
Virtual, upright and enlarged done
clear
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question_answer15)
An object O is placed at the position shown in the given figure.
What are the characteristics of the image formed?
A)
Real, inverted and diminished done
clear
B)
Real, inverted and enlarged done
clear
C)
Virtual, upright and enlarged done
clear
D)
No image is formed done
clear
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question_answer16)
A converging lens has a focal length of 15 cm. Given that an object is placed 10 cm from the optical centre of the lens, what are the characteristics of the image formed?
A)
Real, inverted and diminished done
clear
B)
Real, inverted and of the same size as the object done
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C)
Real, inverted and enlarged done
clear
D)
Virtual, upright and enlarged done
clear
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question_answer17)
An object O and its image I drawn to scale are shown below.
Identify the correct position of the converging lens.
A)
P done
clear
B)
Q done
clear
C)
R done
clear
D)
S done
clear
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question_answer18)
A light ray is parallel to the principal axis of a converging lens as shown below.
Identify the correct position of the emergent ray.
A)
Q done
clear
B)
R done
clear
C)
P done
clear
D)
S done
clear
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question_answer19)
An object O is placed at the position shown in the given figure.
What are the characteristics of the image formed?
A)
Real, inverted and diminished done
clear
B)
Real, inverted and of the same size as the object done
clear
C)
Real, inverted and enlarged done
clear
D)
Virtual, upright and enlarged done
clear
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question_answer20)
Find the position, nature and size of the image formed when an object of size 1 cm is placed at a distance of 15 cm from a concave mirror of focal length 10 cm.
A)
On the left side, 30 cm, real, inverted and magnified done
clear
B)
On the left side, 20 cm, virtual, upright and diminished done
clear
C)
On the right side, 30 cm, real, inverted and magnified done
clear
D)
On the right side, 20 cm, virtual, up- right and diminished done
clear
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question_answer21)
A camera uses a converging lens to produce an image on the film. If the focal length of the lens is 10 cm, where can an object be placed from the camera for taking a photograph?
A)
10 cm done
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B)
15 cm done
clear
C)
25 cm done
clear
D)
None of the above done
clear
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question_answer22)
When is refraction of light NOT possible?
(i) The angle of incidence is \[0{}^\circ \]. |
(ii) The two media have the same refractive index. |
(iii) The refractive index is higher than 3.0. |
A)
Only (i) and (ii) done
clear
B)
Only (ii) and (iii) done
clear
C)
Only (i) and (iii) done
clear
D)
(i), (ii) and (iii) done
clear
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question_answer23)
Which of the following does NOT affect the focal length of a convex lens?
A)
Refractive index of the material for making the lens done
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B)
Material of the lens done
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C)
Object distance done
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D)
Thickness of the lens done
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question_answer24)
In an experiment to determine the focal length of a converging lens, the object distance and the image distance recorded were 20 cm and 30 cm respectively. What is the focal length of the converging lens?
A)
10 cm done
clear
B)
12 cm done
clear
C)
15 cm done
clear
D)
18 cm done
clear
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question_answer25)
During the refraction of light, which of the following quantities remains constant?
A)
Wavelength done
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B)
Speed done
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C)
Frequency done
clear
D)
Both (a) and (b) done
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question_answer26)
A converging lens magnifies a real image to four times its original size. Given that the focal length of the converging lens is 20 cm. what is the object distance?
A)
5 cm done
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B)
25 cm done
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C)
40 cm done
clear
D)
100 cm done
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question_answer27)
A converging lens magnifies a virtual image to four times its original size. Given that the focal length of the converging lens is 20 cm, what is the object distance?
A)
5 cm done
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B)
10 cm done
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C)
15 cm done
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D)
25 cm done
clear
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question_answer28)
A concave mirror is made by cutting a portion of a hollow glass sphere of radius 24 cm. Find the focal length of the mirror.
A)
24 cm done
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B)
12 cm done
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C)
6 cm done
clear
D)
18 cm done
clear
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question_answer29)
At which of the following positions do the given mirrors form a virtual image?
A)
In convex mirror at infinity done
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B)
In concave mirror between F and P done
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C)
In plane mirror at all positions done
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D)
All the above done
clear
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question_answer30)
An object is placed at the centre of the curvature of a concave mirror. What is the distance between its image and the pole?
A)
Equal to f done
clear
B)
Between f and 2 f done
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C)
Equal to 2 f done
clear
D)
Greater than 2 f done
clear
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question_answer31)
A ray of light is incident on a concave mirror. If it is parallel to the principal axis, what happens to the reflected ray?
A)
It will pass through the pole. done
clear
B)
It will pass through the centre of curvature. done
clear
C)
It will pass through the focus. done
clear
D)
It will retrace its path. done
clear
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question_answer32)
What is the distance between a real object and its real image in the case of a concave mirror, when the object is placed at the centre of curvature?
A)
f done
clear
B)
2f done
clear
C)
4f done
clear
D)
Zero done
clear
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question_answer33)
Which of the given mirrors can be used to get an image larger than the object?
A)
A convex mirror done
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B)
A concave mirror done
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C)
Either a convex or a concave mirror done
clear
D)
A plane mirror done
clear
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question_answer34)
If an incident ray passes through the centre of curvature of a concave mirror, what happens to the reflected ray?
A)
It will pass through the pole of the mirror. done
clear
B)
It will pass through the focus of the mirror. done
clear
C)
It will retrace its path. done
clear
D)
It will be parallel to the principal axis. done
clear
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question_answer35)
Identify a mirror which neither converges or diverges a parallel beam of light rays falling on it.
A)
Plane mirror done
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B)
Convex mirror done
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C)
Concave mirror done
clear
D)
Convexo-Concave mirror done
clear
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question_answer36)
Where should an object be placed so that a real and inverted image of the same size is formed by a convex lens?
A)
At infinity done
clear
B)
At the focus of the lens done
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C)
At twice its focal length done
clear
D)
Between f and the lens done
clear
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question_answer37)
If a real object is placed in front of a convex lens of focal length 'f' at its principal focus, where is the image formed?
A)
At zero done
clear
B)
At infinity done
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C)
At a distance of 2f done
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D)
At a distance f/2 done
clear
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question_answer38)
Which of the following always produces a diminished image of an object?
A)
A convex mirror done
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B)
A concave mirror done
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C)
A convex lens done
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D)
Bi-convex lens done
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question_answer39)
A monochromatic beam of light passes from a denser medium into a rarer medium. What is the result?
A)
Its velocity increases. done
clear
B)
Its velocity decreases. done
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C)
Its frequency decreases. done
clear
D)
Its wavelength increases. done
clear
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question_answer40)
In which mirror does one find the image long and thin?
A)
Concave mirror done
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B)
Convex mirror done
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C)
Cylindrical mirror done
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D)
Parabolic mirror done
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question_answer41)
By using which of the following mirrors can you burn a piece of paper using the reflected rays of the sun?
A)
A plane mirror done
clear
B)
A concave mirror done
clear
C)
A convex mirror done
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D)
All of the above done
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question_answer42)
When sun rays are focussed with a convex lens, a sharp, bright spot is observed at its focus. What does this spot indicate?
A)
The real image of the sun done
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B)
The virtual image of the sun done
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C)
An optical illusion produced by the convex lens done
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D)
The magnified image of the sun done
clear
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question_answer43)
Which of the following statements is NOT correct?
A)
A medium with larger refractive index is optically denser than a medium with smaller refractive index. done
clear
B)
The speed of light is less in a rarer medium than a denser medium. done
clear
C)
Refraction is due to the change in speed of light as it enters from one medium to another. done
clear
D)
The absolute refractive index of a medium is simply called its refractive index. done
clear
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question_answer44)
A ray of light is incident on a plane mirror at an angle of incidence \[30{}^\circ \] to the normal. With what angle is the ray deviated, after reflection?
A)
\[\text{3}0{}^\circ \] done
clear
B)
\[\text{6}0{}^\circ \] done
clear
C)
\[\text{9}0{}^\circ \] done
clear
D)
\[\text{12}0{}^\circ \] done
clear
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question_answer45)
Only one of the following applies to a concave lens. Identify it.
A)
The focal length is positive. done
clear
B)
The object distance can be positive or negative. done
clear
C)
The height of the image can be positive or negative. done
clear
D)
Image distance is always negative. done
clear
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question_answer46)
In which of the following is the focal length always positive?
A)
Plane mirror done
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B)
Concave lens done
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C)
Convex lens done
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D)
All of the above done
clear
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question_answer47)
Which of the following lens would you prefer to use while reading small letters found in a dictionary?
A)
A convex lens of focal length 50 cm. done
clear
B)
A concave lens of focal length 50 cm. done
clear
C)
A convex lens of focal length 5 cm. done
clear
D)
A concave lens of focal length 5 cm. done
clear
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question_answer48)
A ray of light travels from water to glass as shown below. The refractive index of water is 1.3 and the refractive index of glass is 1.5.
What is the angle of refraction?
A)
\[\text{3}0.\text{7}{}^\circ \] done
clear
B)
\[\text{35}.\text{3}{}^\circ \] done
clear
C)
\[\text{41}.\text{7}{}^\circ \] done
clear
D)
\[\text{48}.\text{6}{}^\circ \] done
clear
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question_answer49)
Two light rays travelling parallel to the principal axis strike a converging lens and meet at a point as shown.
Which point is called the focal point?
A)
R done
clear
B)
P done
clear
C)
Q done
clear
D)
S done
clear
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question_answer50)
An incident ray strikes a rectangular glass block as shown below.
Which of the given emergent rays is the correct one?
A)
\[{{E}_{1}}\] done
clear
B)
\[{{E}_{2}}\] done
clear
C)
\[{{E}_{3}}\] done
clear
D)
\[{{E}_{4}}\] done
clear
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