Optics Question 214

Question: The radius $ r $ of half period zone is proportional to

[RPMT 1998, 2002]

Options:

A) $ \sqrt{n} $

B) $ \frac{1}{\sqrt{n}} $

C) $ n^{2} $

D) $ \frac{1}{n} $

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Answer:

Correct Answer: A

Solution:

$ r _{n}=\sqrt{nd\lambda }\Rightarrow r _{n}\propto \sqrt{n} $



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