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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
In the equation `v = lambda f` we have f = constant
`therefore v prop lambda`
Since red light has maximum wavelength in the white light, its velocity would be maximum and so it will come out of glass slab first of all the remaining colours.
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KUMAR PRAKASHAN-RAY OPTICS AND OPTICAL INSTRUMENTS-SECTION-C (NCERT EXEMPLAR SOLUTION) (MULTIPLE CHOICE QUESTIONS (MCQs))
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