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KCET2012PhysicsRay Optics

White light is incident normally on a glass slab. Inside the glass slab,

Options

  1. Aall colours travel with the same speed
  2. Bred light travels faster than other colours
  3. Cviolet light travels faster than other colours
  4. Dyellow light travels faster than other colours

Correct answer

B. red light travels faster than other colours

Step-by-step solution

Refractive index is least for red colour (by Cauchy's formula, hence speed of red light is maximum in glass.

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