Optics Question 204

Question: Which statement is correct for a zone plate and a lens

[RPMT 2002]

Options:

A) Zone plate has multi focii whereas lens has one

B) Zone plate has one focus whereas lens has multiple focii

C) Both are correct

D) Zone plate has one focus whereas a lens has infinite

Show Answer

Answer:

Correct Answer: A

Solution:

Multiple focii of zone plate given by $ f _{p}=\frac{r _{n}^{2}}{(2p-1)\lambda } $ , where $ p=1,2,3…… $



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