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
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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