Which statement is correct for a zone plate a | vedclass

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Question

(A) zone plate acts as a diffraction device and possesses multiple foci,which are given by the formula $f_p = \frac{r_n^2}{(2p - 1)\lambda}$,where $p

Vedclass · Accepted Answer

Zone plate has multiple foci,whereas a lens has one.

Vedclass · Answer

(A) zone plate acts as a diffraction device and possesses multiple foci,which are given by the formula $f_p = \frac{r_n^2}{(2p - 1)\lambda}$,where $p = 1, 2, 3, \dots$ and $r_n$ is the radius of the $n$-th zone.In contrast,a standard convex lens is a refractive device that typically has a single focal point for parallel incident rays.

Which statement is correct for a zone plate and a lens?

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