top surface of water contained in a beaker and held above the eye level appears
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Appears silvery in colour due to the phenomenon refraction.Actually a critical angle is formed in which the refracted ray moves at the angle of 90° and passes through the separating surface
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Critical angle of water is 48, the rays of light entering water from below, suffer refraction and strike the water-air surface at an angle which is greater than 48, they get total internal reflected.
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