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A ray of light PQ is incident normally on the face AB of an equilateral prism. The ray gets totally reflected from the surface AC.

A ray of light PQ is incident normally on the face AB of an equilateral prism. The ray gets totally reflected from the surface AC. ICSE 2025 Improvement Physics Solved Question Paper.

Calculate:

(a) the angle of deviation at AC.

(b) the angle of incidence at BC.

Refraction Plane Surfaces

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Answer

From the below diagram,

A ray of light PQ is incident normally on the face AB of an equilateral prism. The ray gets totally reflected from the surface AC. Calculate (a) the angle of deviation at AC (b) the angle of incidence at BC. ICSE 2025 Improvement Physics Solved Question Paper.

(a) As, the incident ray and emergent ray makes an angle of 60° with each other.

So, angle of deviation at AC is 60°.

(b) Here, emergent ray is falling normally on face BC.

So, angle of incidence at BC is 0°.

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