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Suppose that a pane of crown glass, with a refractive index of 1.52, is immersed in water, which has a refractive index of 1.33. A ray of light traveling in the water strikes the glass at 45° relative to the normal and travels through the pane. What angle, relative to the normal, will the ray of light subtend when it leaves the pane and reenters the water? 38° 54° 32° 45° No angle at all! The premise is wrong. The light will never enter the glass. It will be reflected when it strikes the glass surface.

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