Physics
In the figure given below, 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°.
(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.
Refraction Plane Surfaces
ICSE
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Answer
(a) The angle of incidence at the faces AB, i = 0°.
The angle of incidence at the faces AC, i = 60°.
(b) The phenomenon which the ray of light suffers at:
face AB — refraction
face AC — total internal reflection
face BC — refraction
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