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Chapter 25: Q22PE (page 930)

An optical fibre uses flint glass clad with crown glass. What is the critical angle?

Short Answer

Expert verified

The critical angle is 66.3掳.

Step by step solution

01

Definition of critical angle

The critical angle is the angle of incidence that produces a 90-degree angle of refraction.

02

Critical angle of fibre glass

Let us consider the given problem.

The expression to find the critical angle:

胃鈭�=sin-1n2n1........(1)

Here,

胃鈭�Is critical angle

n1Is index of refraction of medium

n2Is index of refraction of medium 2

Substituting 1.52 for n1 and 1.66 for n2 by in equation (1),

胃鈭�=sin-11.521.66=66.3掳

Therefore, when optical fibre is encased in flint with crown glass, the critical angle is 66.3掳.

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