In Fig. 4.67, a ray of light PQ is incident normally on the face AB of an equilateral glass prism. Complete the ray diagram showing its emergence into air after passing through the prism. Take critical angle for glass = $42^{\circ}$ .

(a) Write the angles of incidence at the faces AB and AC of the prism.

(b) Name the phenomenon which the ray of light suffers at the face AB, AC and BC of the prism.[3 marks]

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Solution

(a) At the face AB, i = $0^{\circ}$ and at the face AC, i = $60^{\circ}$
(b) At the face AB – Refraction
At the face AB – Total internal reflection
At the face BC – Refraction

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(a) At the face AB, i = 0∘ and at the face AC, i = 60∘ (b) At the face AB – Refraction At the face AB – Total internal reflection At the face BC – Refraction

(a) At the face AB, i = $0^{\circ}$ and at the face AC, i = $60^{\circ}$
(b) At the face AB – Refraction
At the face AB – Total internal reflection
At the face BC – Refraction