A ray of light is incident on a piece of glass at an angle of 45 degree. If the angle of refraction is 25.37 degree find (a) refractive index (b) the critical angle.
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So for angles of incidence greater than 48.6-degrees, TIR occurs. But 48.6 degrees is the critical angle only for the water-air boundary. The actual value of the critical angle is dependent upon the two materials on either side of the boundary. For the crown glass-air boundary, the critical angle is 41.1 degrees.
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