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

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

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

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

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

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Solution

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