The lens A produces a magnification of, $-$0.6 whereas lens B produces amagnification of $+$0.6.(a) What is the nature of lens A?(b) What is the nature of lens B?

​(a) The nature of lens A is convex.


Explanation The nature of lens A is convex because the negative magnification $(-0.6)$  shows that the image produced by the lens is real and inverted, which can only be produced by convex lens. Therefore, it is a convex lens.


​(b) The nature of lens B is concave.


Explanation

The nature of lens B can be convex or concave because the positive magnification shows that the image produced by the lens is virtual and erect. However, a convex lens always forms a magnified virtual image. But, according to the given magnification, the size of the image $(0.6)$ is less than 1, which implies that it is smaller than the size of the object. Therefore, the lens must be a concave lens.

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Updated on: 10-Oct-2022

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