Exercise 4D Q21 | In Fig a ray of light PQ is incident normally on the face AB

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 = 420. (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.
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