# A light ray is incident on a rectangular glass slab at an angle of 60°. What is the angle between the ray coming out of the slab and

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A light ray is incident on a rectangular glass slab at an angle of 60°. What is the angle between the ray coming out of the slab and the normal to the face of rectangular slab from which it comes out?

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Ray of light strikes the mirror at an angle of 60°.

⇒ It will make an angle of 300 (900 – 600) with the normal.

∴ Angle of incidence = 300.

Now, By laws of refraction;

µ = $\frac{Sin\,i}{Sin\,r}$

Angle of incidence is 60°

Refractive index of glass slab is 1.5

Putting the value in the above equation, we get

1.5 = $\frac{0.866}{sin\,r}$

On solving the above equation, we get

sin r = $\frac{0.866}{1.5}$

Angle of refraction, r= 35.26°

Thus the angel of refraction is 35.26° from the normal.