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Physics

For the same angle of incidence, the angles of refraction in three different media A, B and C are 15°, 25°, and 35° respectively. In which medium will the velocity of light be minimum?

Refraction Plane Surfaces

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Answer

Medium A will have the minimum velocity of light.

Reason — For the same angle of incidence, the medium in which the angle of refraction is smallest has the highest refractive index.

Here, the angles of refraction are:

  • In A = 15°
  • In B = 25°
  • In C = 35°

Since, 15° is the smallest angle, medium A has the greatest refractive index.

We know that:

v=cnv = \dfrac{c}{n}

So, the greater the refractive index, the smaller is the velocity of light in that medium.

∴ Velocity of light is minimum in medium A.

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