JEE PHYSICS MCQ: RAY OPTICS

1 Medium

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Application +4 | -1

A convex lens 'A' of focal length 30 cm and a
concave lens 'B' of focal length 10 cm are kept
along the same axis with a distance 'd' between
them. If a parallel beam of light falling on 'A' leaves
'B' as a parallel beam, then the distance 'd' in cm
will be:

View answer and explanation

Correct option: D

Option D (20) is correct because for the beam to remain parallel after passing through both lenses, the focal point of the convex lens must coincide with the focal point of the concave lens.

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