SATHEE: Optics Question 207

Optics Question 207

Question: A zone plate of focal length $60 c m,$ behaves as a convex lens, If wavelength of incident light is $6000 A A,$ then radius of first half period zone will be

[RPMT 2001]

Options:

A) $36 \times 10^{- 8} m .$

B) $6 \times 10^{- 8} m .$

C) $\sqrt{6} \times 10^{- 8} m .$

D) $6 \times 10^{- 4} m .$

Show Answer

Answer:

Correct Answer: D

Solution:

By using $f_{p} = \frac{r^{2}}{(2 p - 1) λ}$ For first $H P Z$

$r = \sqrt{f_{p} λ} = \sqrt{0.6 \times 6000 \times 10^{- 10}}$

$= 6 \times 10^{- 4} m .$

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Optics Question 207

Question: A zone plate of focal length 60cm, behaves as a convex lens, If wavelength of incident light is 6000AA, then radius of first half period zone will be

Options:

Answer:

Solution:

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Question: A zone plate of focal length $60 c m,$ behaves as a convex lens, If wavelength of incident light is $6000 A A,$ then radius of first half period zone will be