Density and Elasticity
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REFRACTION AT PLANE SURFACES Refraction is a phenomenon, due to which a ray of light deviates from its original path, while travelling from one optical medium to another optical medium. The change of direction is caused by a change in speed of light in different medium. For example, when light travels from air into water, it slows down; causing it to continue to travel at a different direction as a result it deviates. In the case of homogeneous medium light travels along a straight line. Refraction is the bending property of light as it passes from one transparent medium to another. When light passes from a less dense to more dense medium, (for example passing from air into water), the light is refracted (or bent) towards the normal as shown in [Fig. 15.1]. The bending occurs because light travels slowly in a denser medium...
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