When light is perpendicularly incident on a plane-parallel glass plate, the ratio of light energies in the reflected and incident rays (reflection coefficient) is equal to R. Express R in terms of the coefficients of light reflection from the air-glass and glass-air boundaries, assuming they are the same and equal to r. When deciding to take into account multiple reflections of light in a plane-parallel plate. Neglect the absorption of light in the plate.
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