#### Question

Define Snell's law of refraction. A ray of light is incident on a glass slab at an angle of incidence of 60°. If the angle of refraction be 32.7°, calculate the refractive index of glass. (Given : sin 60° = 0.866, and sin 32.7° = 0.540).

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#### Solution

According to Snell's law, the ratio of sines of the angles of incidence and refraction is constant for a given pair of mediums.

We get:

sin i /sin r = n (constant)

This constant is called refractive index.

According to the question:

Angle of incidence, i = 60°

Angle of refraction, r = 32.7°

Refractive index, n = ?

Applying the above formula, we get:

sin i / sin r = n

or, n = sin 60°/ sin 32.7°

= 0.866/0.540 = 1.60

Thus, the refractive index of glass is 1.60.

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Solution for question: Define Snell'S Law of Refraction. a Ray of Light is Incident on a Glass Slab at an Angle of Incidence of 60°. If the Angle of Refraction Be 32.7°, Calculate the Refractive Index of Glass. (Given : Sin 60° = 0.866, and Sin 32.7° = 0.540). concept: Refraction of Light - Refractive Index. For the course CBSE