10th Class Science Light - Reflection and Refraction Question Bank

done Light Reflection and Refraction Total Questions - 20

• question_answer1)
  PQRS shows the walls of room each measuring 8 m, such that wall PO has a full length plane mirror. A camera is placed at M the mid point of wall SR. In order to take clear image of the point R, the camera should be focused at
  A)
  4 m                               done clear
  B)
  8 m                 done clear
  C)
  16 m                 done clear
  D)
         More than 16 metres done clear
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• question_answer2)
  Four optical media A, B, C and D have optical densities 1.35, 1.21, 1.58 and 1.002 respectively. In which optical medium will the light travel fastest?
  A)
  A                                  done clear
  B)
  B                      done clear
  C)
  C                     done clear
  D)
  D            done clear
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• question_answer3)
  In a slide projector, light from a lamp is incident on to a slide MN and a lens is used to form an image of the slide on a screen as shown in figure. What kind of image is formed on the screen?
  A)
  Real, magnified, inverted done clear
  B)
  Real, diminished, inverted done clear
  C)
  Virtual, magnified, erect done clear
  D)
  Virtual, diminished, erect done clear
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• question_answer4)
  Read the given statements and select the correct option.

  Statement 1: Even when one half of a convex lens is covered with a black paper, the lens will produce a complete image.

  Statement 2: Intensity of image is reduced when we cover the half of a convex lens with a black paper.

   
  A)
  Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1. done clear
  B)
  Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1. done clear
  C)
  Statement 1 is true but statement 2 is false. done clear
  D)
  Both statements 1 and 2 are false. done clear
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• question_answer5)
  In the following figures, optical instruments are placed inside boxes (a) and (b). Which of the following options is correct for these?
  A)
  In (a), the incident rays are diverged after refractions, so lens is concave. done clear
  B)
  In (b), the incident rays are converged after refraction so mirror is convex. done clear
  C)
  In (a), the incident rays are diverged after refraction so mirror is convex. done clear
  D)
  In (b), the incident rays are converged after refraction so lens is concave. done clear
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• question_answer6)

  Direction: Read the passage carefully and answer the following question. The path of a light ray from air to two different media A and B for a given angle of incidence is as shown.

  If \[{{n}_{A}}\]and \[{{n}_{B}}\] are the refractive indices of two media, then
  A)
  \[{{n}_{A}}={{n}_{B}}\]                     done clear
  B)
  \[{{n}_{A}}>{{n}_{B}}\]         done clear
  C)
  \[{{n}_{A}}<{{n}_{B}}\]         done clear
  D)
  Cannot be said. done clear
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• question_answer7)

  Direction: Read the passage carefully and answer the following question. The path of a light ray from air to two different media A and B for a given angle of incidence is as shown.

  If angle of incidence is increased in both media, then angle of refraction will
  A)
  Increase done clear
  B)
  Decrease done clear
  C)
  Remain same done clear
  D)
  Become zero in medium A and will remain same in medium B. done clear
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• question_answer8)
  In the given diagram, three rays of light pass through focal point \[{{F}_{1}}\]to the converging lens, placed along vertical line. Which of the following is correct regarding this?
  A)
  The speed of light rays decreases when they enter the converging lens. done clear
  B)
  The speed of light rays decreases when they leave the converging lens. done clear
  C)
  The speed of light rays increases when they enter the converging lens. done clear
  D)
  The speed of light rays remains same while entering or leaving the converging lens. done clear
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• question_answer9)
  A ray of light passing through a semicircular block from air is shown below. Consider the given figure and select the correct option which correctly identifies the true (T) and false (F)?

  (i) There is no change in the direction of ray at P because light ray incident on semicircular block at \[90{}^\circ .\]

  (ii) As light rays enters the semicircular block, its frequency remains the same.

  (iii) Wavelength of light rays as it enters the block decreases.

  (iv) Speed of light as it enters the block increases.

   
  A)

  (i)	(ii)	(iii)	(iv)
  T	F	F	T

    done clear
  B)

  (i)	(ii)	(iii)	(iv)
  F	T	T	F

    done clear
  C)

  (i)	(ii)	(iii)	(iv)
  T	T	T	F

    done clear
  D)

  (i)	(ii)	(iii)	(iv)
  F	F	F	T

    done clear
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• question_answer10)
  A man standing at a position X in front of a plane mirror, a distance of y metre from the mirror as shown in figure. When the man moves 5 m away from the mirror, the new distance between the man and his image becomes 20 metre. What is the value of y?
  A)
  5 m                               done clear
  B)
  10 m     done clear
  C)
         20 m                 done clear
  D)
         40 m done clear
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• question_answer11)
  To produce an image by a convex lens, at the position shown (see figure) the object is needed to be placed
  A)
  Between Y and O done clear
  B)
  At Y done clear
  C)
  Between X and Y done clear
  D)
  At X done clear
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• question_answer12)
  Which of the following correctly represents graphical relation between sine of angle of incidence (i) and sine of angle of refraction (r) for a given medium?
  A)
  done clear
  B)
  done clear
  C)
  done clear
  D)
  done clear
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• question_answer13)
  When two plane mirrors are placed parallel and facing each other and an object is kept in between them, we get infinite images. But actually only a few images are visible because the intensity of the image is
  A)
  Increased after each reflection done clear
  B)
  Decreased after each reflection done clear
  C)
  Always constant done clear
  D)
  None of these done clear
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• question_answer14)
  A rectangular block of glass PQRS has a refractive index 1.6. A pin is placed midway on the face PQ. When observed from the face PS the pin shall
  A)
  Appear to be near P always done clear
  B)
  Appear to be at the centre of PS done clear
  C)
  Appear to be near S done clear
  D)
  None of these done clear
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• question_answer15)
  Which of the following options is correct in case of a concave mirror?
  A)

  Object position	Image position	Image size	Nature of image
  At C	At C	Equal to object	Real and inverted

                  done clear
  B)

  Object position	Image position	Image size	Nature of image
  Beyond C	Between F and C	Diminished	Virtual and erect

                  done clear
  C)

  Object position	Image position	Image size	Nature of image
  Between F and C	At infinity	Enlarged	Real and inverted

                  done clear
  D)

  Object position	Image position	Image size	Nature of image
  At F	At infinity	Highly diminished	Virtual and erect

    done clear
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• question_answer16)
  Which of the following correctly depicts reflections in case of plane mirrors inclined at \[40{}^\circ ?\]
  A)
               done clear
  B)
  done clear
  C)
                done clear
  D)
    done clear
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• question_answer17)
                          The image of an extended object placed in front of a concave mirror is formed at a distance of 40 cm from the object. If the image is 3 times bigger than the object, the magnitude of focal length of the mirror is
  A)
  15 cm                           done clear
  B)
  10 cm   done clear
  C)
  20 cm                 done clear
  D)
  5 cm                 done clear
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• question_answer18)
  Two plane mirrors A and B are aligned parallel to each other as shown in the figure. A light ray is incident at an angle \[30{}^\circ \] at a point just inside one end of A. The plane of incidence coincides with the plane of the figure. The maximum number of times the ray undergoes reflections (including the first one), before it emerges out, is
  A)
  28                     done clear
  B)
  30                     done clear
  C)
  32                     done clear
  D)
  34 done clear
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• question_answer19)
  A mirror is broken into two parts and these parts are separated by a distance of 1 cm as shown in figure. The focal length of the mirror is 10 cm. The height of the images (in cm), formed by the two parts of mirror when the object is midway between the two principal axes are
  A)
  1, 1                   done clear
  B)
         1, 2                   done clear
  C)
  2, 2                   done clear
  D)
         0, 5, 1 done clear
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• question_answer20)
  A ray of light travels from a medium of refractive index n into air. If the angle of incidence at the plane surface of separation is \[\theta \] and the corresponding angle of deviation is \[\delta ,\] the variation of \[\delta \] with \[\theta \] is shown correctly in the figure
  A)
            done clear
  B)
            done clear
  C)
              done clear
  D)
  done clear
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