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Question

Study the given ray diagrams and select the correct statement from the following:
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  1. Device X is a concave lens and device Y is a convex mirror, whose focal lengths are 20cm and 25cm respectively.
  2. Device X is a concave lens and device Y is a concave mirror, whose focal lengths are 20cm and 25cm respectively.
  3. Device X is a concave mirror and device Y is a convex lens, whose focal lengths are 20cm and 25cm respectively.
  4. Device X is a convex lens and device Y is a concave mirror, whose focal lengths are 20cm and 25cm respectively.

A
Device X is a concave lens and device Y is a convex mirror, whose focal lengths are 20cm and 25cm respectively.
B
Device X is a concave lens and device Y is a concave mirror, whose focal lengths are 20cm and 25cm respectively.
C
Device X is a concave mirror and device Y is a convex lens, whose focal lengths are 20cm and 25cm respectively.
D
Device X is a convex lens and device Y is a concave mirror, whose focal lengths are 20cm and 25cm respectively.
Solution
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In the first case, The ray of light is converging, when passing from lens X, so it is a convex lens.
In the second case, the ray of light is diverging, when getting reflected from the mirror Y, so it is a concave mirror.

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