Figures 9.34(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 45º with the normal to a water-glass interface [Fig. 9.34(c)].

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As per the given figure, for the glass − air interface: Angle of incidence, i = 60° Angle of refraction, r = 35° The relative refractive index of glass with respect to air is given by Snell’s law as: As per the given figure, for the air − water interface: Angle of incidence,...
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As per the given figure, for the glass − air interface: Angle of incidence, i = 60° Angle of refraction, r = 35° The relative refractive index of glass with respect to air is given by Snell’s law as: As per the given figure, for the air − water interface: Angle of incidence, i = 60° Angle of refraction, r = 47° The relative refractive index of water with respect to air is given by Snell’s law as: Using (1) and (2), the relative refractive index of glass with respect to water can be obtained as: The following figure shows the situation involving the glass − water interface. Angle of incidence, i = 45° Angle of refraction = r From Snell’s law, r can be calculated as: Hence, the angle of refraction at the water − glass interface is 38.68°. read less
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