The following table gives the values of the angle of deviation, for different values of the angle of incidence, for a triangular prism :
Angle of Incidence 33° 38° 42° 52° 60° 71°
Angle of Deviation 60° 50° 46° 40° 43° 50°

(a) For what value of the angle of incidence, is the angle of emergence likely to be equal to the angle of incidence itself?
(b) Draw a ray diagram, showing the passage of a ray of light through this prism when the angle of incidence has the above value.

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