(a) and (b) show refraction of a ray in incident at `60^@` with the normal to a glass-air interface respectively.Predict the angle of refraction in glass when the angle of incidence in water is `45^@` with the normal to a water-glass interface[Fig.6.01(c)].
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Figures (a) and (b) show refraction of a ray in air incident at 60^@ with the normal to a glass-air and water-air interface, respectively. Predict the angle of refraction in glass when the angle of incidence in water is 45^@ with the normal to a water-glass interface [Fig. (c)]. :

What is the angle of incidence when incident ray falls normal to the mirror?

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