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When a ray of light enters a glass slab ...

When a ray of light enters a glass slab form air,

A

its wavelength decreases

B

its wavelength increases

C

its frequency decreases

D

neither its wavelength nor its frequency changes

Text Solution

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The correct Answer is:
C
NOTE: 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. `(:' v=vlamda)`
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