Optics Question 208

Question: Radius of central zone of circular zone plate is $ 2.3mm. $ Wavelength of incident light is $ 5893{AA}. $ Source is at a distance of $ 6m. $ Then the distance of first image will be

[RPMT 2001]

Options:

A) $ 9m $

B) $ 12m $

C) $ 24m $

D) $ 36m $

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Answer:

Correct Answer: A

Solution:

$ f _{1}=\frac{r^{2}}{\lambda }=\frac{{{(2.3\times {{10}^{-3}})}^{2}}}{5893\times {{10}^{-10}}}=9m. $



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