Optics Question 208

Question: Radius of central zone of circular zone plate is 2.3mm. Wavelength of incident light is 5893AA. 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

Show Answer

Answer:

Correct Answer: A

Solution:

f1=r2λ=(2.3×103)25893×1010=9m.



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