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question_answer1) A point object O is placed on the principal axis of a convex lens of focal length 20 cm at a distance of 40 cm to the left of it. The diameter of the lens is 10 cm. If the eye is placed 60 cm to the right of the lens at a distacne h below the principal axis, then the maximum value of h (in cm) to see the image will be ?
question_answer2) The focal lengths of the objective and the eye-piece of a compound microscope are 1 cm and 5 cm respectively. An object is placed at a distacne of 1.1 cm from the objective. If the final image is formed at the least distance of distinct vision, the magnifying power is?
question_answer3) A compound microscope has magnifying power as 32 and magnifying power of eye-piece is 4, then the magnifying power of objective is?
question_answer4) A police inspector is chasing a thief who is running away in a car with a speed 3 m/s. The speed of police jeep is 12 m/s, then speed (in m/s) of image of police jeep as seen by thief in the rear view mirror when police jeep is at a distance of 30 m is (Given that focal length of rear view mirror is 15 m)?
question_answer5) A simple telescope, consisting of an objective of focal length 60 cm and a single eye lens of focal length 5 cm is focussed on a distant object in such a way that parallel rays emerge from the eye lens. If the object subtends an angle of \[2{}^\circ \]at the objective, the angular width of the image is? (n degree)
question_answer6) Magnification produced by astronomical telescope for normal adjustment is 10 and length of telescope is 1.1 m. The magnification when the image is formed at least distance of distinct vision \[(D=25cm)\] is?
question_answer7) The exposure time (in sec) of a camera a lens at f/2.8 setting is 1/200 seconds. The correct time of exposure for f/5.6 setting is?
question_answer8) A point object O is placed at a distance of 30 cm from a convex lens (focal length 20 cm) cut into two halves each of which is displaced by 0.05 cm as shown in figure. Position of the image is 60 cm. If more than one image is formed, then find distance (in cm) between them.
question_answer9) A point object is placed at a distance of 25 cm from a convex lens. A glass slab of thickness 15 cm and the\[R.\text{ }I=3/2\]is inserted between lens and object. The image is formed at infinity. Find focal length (in cm) of the lens?
question_answer10) A telescope has an objective lens of focal length 200 cm and an eye piece with focal length 2 cm. If this telescope is used to see a 50 meter tall building at a distance of 2 km, what is the height (in cm) of the image of the building formed by the objective lens.
question_answer11) The head lights of a jeep are 1.2 m apart. If the pupil of the eye of an observer has a diameter of 2 mm and light of wavelength \[\text{5896}\overset{\text{o}}{\mathop{\text{A}}}\,\] is used, what should be the maximum distance (in km) of the jeep from the observer if the two head lights are just separated?
question_answer12) In a compound microscope the focal lengths of two lenses are 1.5 cm and 6.25 cm. If an object is placed at 2 cm from objective and final image is formed at 25 cm from eye lens, the distance between the two lenses is (in cm)?
question_answer13) A pole of 8 m height is situated on a horizontal road side. Sun rays at an angle of \[60{}^\circ \]with the vertical are falling on the pole. The size of the shadow (in m) on the horizontal surface will be?
question_answer14) A man has a concave shaving mirror of focal length 0.2 m. How far should the mirror be held from his face in order to give an image of two told magnification?
question_answer15) The image of an object placed on the principal axis of a concave mirror of focal length 12 cm is formed at a point which is 10 cm more distant from the mirror than the object. The magnification of the image is?
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