A spherical mirror and a thin spherical lens have focal length of $- 20 c m$ . The mirror and lens will be:

Both concave

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Both convex

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Mirror is concave and the lens is convex

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Mirror is convex but lens is concave

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Solution

The correct option is B Both concave
Both concave mirror and concave lens has negative focal length.

Answer-(A)

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Similar questions

A spherical mirror and a thin spherical lens have each a focal length of −15 cm. The mirror and the lens are likely to be

(a) both concave

(b) both convex

(d) the mirror is convex, but the lens is concave

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