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A short pulse of white light is incident...

A short pulse of white light is incident from air to a glass slab at normal incidence. After travelling through the slab, the first colour to emerge is.

A

Blue

B

Green

C

Violet

D

Red

Text Solution

Verified by Experts

The correct Answer is:
D
Since v `prop lambda` , the light of red colour is of highest wavelength and therefore of highest speed. Therefore, after travelling through the slab, the red colour will emerge first.
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