)
(b) Is the speed of
light in glass independent of the colour of light ? If not, which of the two colours
red and violet travels slower ina glass prism ?
Answer:
(a) Here,
Speed of
light in glass, 
(b) Clearly,
the speed of light when passingthrough glass depends on colour of light.
therefore
the velocity of violetcomponent is less than the red one.
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