For efficient transmission through an optical fibre placed in air

PHYSICS · Single correct · A Level · Physics · Waves · Waves

Problem

For efficient transmission through an optical fibre placed in air, which one of the following inequalities between the refractive indices must be satisfied? (a)

n_{\text{core}} > n_{\text{air}} > n_{\text{clad}}

(b)

n_{\text{clad}} > n_{\text{core}} > n_{\text{air}}

(c)

n_{\text{core}} > n_{\text{clad}} > n_{\text{air}}

(d)

n_{\text{core}} < n_{\text{clad}} < n_{\text{air}}

Related theory

Critical Angle
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Refraction and total internal reflection
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