A) its wavelength decreases
B) its wavelength increases
C) its frequency decreases
D) neither its wavelength nor its frequency changes.
Correct Answer: A
Solution :
[a] When the ray enters a glass slab from air, its frequency remains unchanged. Since glass slab in an optically denser medium, the velocity of light decreases and therefore we can conclude that the wavelength decreases. \[(\because \,\,\,\,v=v\lambda )\]
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