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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°.

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:

θ∘=sin-1n2n1........(1)

Here,

θ∘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),

θ∘=sin-11.521.66=66.3°

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

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