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} $
Show Answer
Answer:
Correct Answer: A
Solution:
$ r _{n}=\sqrt{nd\lambda }\Rightarrow r _{n}\propto \sqrt{n} $