Optics Question 730
Question: A beam of monochromatic blue light of wavelength $ 4200{AA} $ in air travels in water ( $ \mu =4/3 $ ). Its wavelength in water will be
[MNR 1991; UPSEAT 2000]
Options:
A) $ 2800{AA} $
B) $ 5600{AA} $
C) $ 3150{AA} $
D) $ 4000{AA} $
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Answer:
Correct Answer: C
Solution:
$ \mu \propto \frac{1}{\lambda } $
Therefore $ \frac{1}{4/3}=\frac{x}{4200}\Rightarrow x=3150 $ $ {AA} $
