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A ray of light strikes the glass slab at an angle of 90°. What are the angle of incidence and the angle of refraction?

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Best answer

Since the ray strikes the glass slab at an angle of 90°. Therefore

Angle of incidence = 00.

Thus the ray of light will pass straight without any deviation as shown in the figure below. 

Laws of Refraction of light; 

µ = \(\frac{Sin\,i}{Sin\,r}\)

Refractive index=1.5 

Thus angle of refraction is given by 

1.5 = \(\frac{0}{Sin\,r}\)

On solving, we get

sin r = 0

Thus the angle of refraction is 0°

Thus the refracted ray is perpendicular to the surface of the glass slab as shown in the above diagram.

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