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

1.	Study the given ray diagrams and select the correct statement from the following :
Answer» Device X is a concave MIRROR and device Y is a convex lens, whose focal lengths are `20 cm` and `25 cm` respectively. Device X is a convex lens and device Y is a concave mirror, whose focal lengths are `10 cm` and `25 cm` respectively. Device X is a concave lens and device Y is a convex mirror, whose focal lengths are `20 cm` and `25 cm` respectively. Device X is a convex lens and device Y is a concave mirror, whose focal lengths are `20 cm` and `25 cm` respectively. Solution :(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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