Is it possible for a lens to act as a converg | vedclass

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Question

(A) Yes,it is possible. The focal length $f$ of a lens in a medium is given by the Lens Maker's Formula: $\frac{1}{f} = (\frac{n_l}{n_m} - 1)(\frac{1}

Vedclass · Accepted Answer

Yes

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(A) Yes,it is possible. The focal length $f$ of a lens in a medium is given by the Lens Maker's Formula: $\frac{1}{f} = (\frac{n_l}{n_m} - 1)(\frac{1}{R_1} - \frac{1}{R_2})$.If the refractive index of the surrounding medium $(n_m)$ is greater than the refractive index of the lens material $(n_l)$,the term $(\frac{n_l}{n_m} - 1)$ becomes negative.This causes the lens to change its nature: a convex lens (convergent) will behave as a concave lens (divergent),and vice versa.

Is it possible for a lens to act as a convergent lens in one medium and a divergent lens in another?

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