Optics Question 740
Question: When light is refracted from air into glass
[IIT 1980; CBSE PMT 1992; MP PET 1999;]
Options:
A) Its wavelength and frequency both increase
B) Its wavelength increases but frequency remains unchanged
C) Its wavelength decreases but frequency remains unchanged
D) Its wavelength and frequency both decrease
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Answer:
Correct Answer: C
Solution:
$ f\propto \frac{1}{\lambda } $ . As $ {\lambda _{b}}<{\lambda _{g}} $
Therefore $ f _{b}>f _{g} $