Geometrical Optics. Light. is a form of radiant energy or external cause which creates sensation of light when enters into our eyes. This radiant energy travels from one place to another place in the form of transverse waves. Ligh tpropagates in a straight line in homogeneous medium. But when light is incident on a secondmedium from first medium some portion of light again causes back in the first medium from thesurface of the second in a straight line. This phenomenon is called reflection of light. Again whenlight tends to go from one transparent medium to another transparent medium its direction ischanged at the surface of separation of the two media. This is known as refraction of light.
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