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Image Formation by Spherical Lenses

A spherical l...

Question

A spherical lens has a focal length $2 c m$ . The lens will be

A

Concave lens

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B

Convex lens

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C

Concavo convex lens

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D

None

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Solution

The correct option is B Convex lens
Concave lens has negative and concavo-convex lens can have negative focal length.
But, convex lens always has positive focal length.

Answer-(B).

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