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Study the given ray diagrams and select ...

Study the given ray diagrams and select the correct statement from the following :

A

Device X is a concave mirror and device Y is a convex lens, whose focal lengths are `20 cm` and `25 cm` respectively.

B

Device X is a convex lens and device Y is a concave mirror, whose focal lengths are `10 cm` and `25 cm` respectively.

C

Device X is a concave lens and device Y is a convex mirror, whose focal lengths are `20 cm` and `25 cm` respectively.

D

Device X is a convex lens and device Y is a concave mirror, whose focal lengths are `20 cm` and `25 cm` respectively.

Text Solution

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The correct Answer is:
D
(d) The device X is a convex lens of focal length 20 cm. Parallel rays falling on convex lens are focussed on the screen at 20 cm from the lens. The device Y is a concave mirror of focal length 25 cm. Parallel rays falling on the concave mirror are focussed on the screen at 25 cm from the concave mirror.
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