A short pulse of white light is incident from air to glass slab at normal incidence. After travelling through the slab, the first colour to emerge is:
1. blue
2. green
3. violet
4. red
(4) Hint: The speed of the light depends on the wavelength.
Step 1: Find the colour with the highest speed.
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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