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A light ray falls on the surface of water (RF of water 4/3) at angle of incidence 45 degrees. What is the angle of refraction for this ray?




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We know by Snell's law :  μ = refractive index = Sin i / Sin r
     where i = angle of incidence in air/vacuum = 45⁰ =π/4
             r = angle of refraction in water
             μ = refractive index of water = 4/3

     Sin r = Sin 45⁰ / (4/3 ) = 3/4√2 = 0.53
       r = 32°

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