A light ray of wavelength 589 nm (produced by a sodium lamp) traveling through air is incident on smooth, flat slab of crown glass at an angle ?1 of 40° to the normal, as sketched in the figure. (a) Find the angle of refraction, ?2. (b) At what angle ?3 does the ray leave the glass as it re-enters the air? (c) How does the answer for the ?3 change if the ray enters water below the slab instead of the air?

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