Question

A ray of light falls normally on a face of a glass slab. What are the values o incidence and angle of refraction of this ray?​

Answer 1

Answer:

Explanation:

      when the ray falls normally on a surface, angle of incidence is 0. 

  since μ₁ Sin i = μ₂ sin r    =>  r is also zero.  The ray goes straight in to the glass medium and emerges out of glass slab at the other surface also at  i = 0 and r = 0. 

          Refractive Index is defined as the ratio of speed of light in vacuum divided by speed of light in the medium.  It is also calculated by the formula: Sin i / Sin r.

            μ = 2.52 = 3 * 10⁸ m /sec / v

              v = 3 * 10⁸ / 2.52 = 1.19 * 10⁸ meters / sec

Answer 2

Answer:

When a ray of light falls on a glass slab normally, angle between normal and incident ray is zero. ∴ Angle of incidence is zero

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