A beam of light in air strikes a plate of crown glass at an angle of incidence of 40°. What is the angle of refraction?
"n_1\\sin40\u00b0=n_2\\sin\\beta\\to"
"\\beta=\\sin^{-1}(n_1\\sin40\u00b0\/n_2)=\\sin^{-1}(1\\cdot\\sin40\u00b0\/1.52)\\approx25\u00b0"
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