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
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Answer:
Red
Explanation:
When light ray goes from one medium to other medium, the frequency of light remains unchanged. The light of red colour is of highest wavelength and therefore of highest speed. Therefore, after travelling through the slab, the red colour emerges first.
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