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Question

Lens A produces a magnification of -0.8 whereas lens B produces a magnification of +0.8. Which one of the following applies to lenses A and B?

A
Both A and B are convex lenses
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B
Both A and Bare concave lenses
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C
A is a concave lens and B is a convex lens
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D
A is a convex lens and B is a concave lens
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Solution

The correct option is C A is a concave lens and B is a convex lens
Since we know that magnification m of lens is given by
m=imagedistanceobjectdistance
m=vu
in case of converging lens vu<0 and in case of diverging lens vu>0 as they are in same side of lens.And it is given that lens B has magnification+ 0.8 , hence it is a concave lens and lens A has a magnification of - 0.8 which means that it is a converging lens i.e. lens A is a convex lens and lens B is a concave lens.

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