Question

A convex lens of focal length and a concave lens of focal length are kept along the same axis with a distance between them as shown in a figure. If a parallel beam falling on emerges parallel from , then is equal to

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A

B

C

D

Medium
Solution
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Correct option is A)

As the incident beam is parallel; (Let the there be no second lens), the image will form at such that
(i) if d is the distance between two lenses, then distance between the image and the concave lens is
(ii) Image will act as object for 2nd refraction and image will be at infinity.

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Solve any question of Ray Optics and Optical Instrument with:-
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