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

When a rays of light enters a glass slab from water

A

its wavelength increases

B

its frequency increases

C

its wavelength decreases

D

its velocity increases

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The correct Answer is:
C
When the rays of light passes from water to air bubble then the refracted rays diverge. Due to that, air bubble inside water behaves as a concave lens.
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