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Lerits, , rm of, Proveg, , lue to, ve get, , ferous, zation, , as in, , yaves, ence, , and, na, , ser, , ion, , ke, , al, , WAVE FRONT AND WAVE NORMAL, , Q. 4. Explain the concept of wavefront., Ans:, , source, wavefro, , Q.6.D, , Ans:, Wave Wave 1, normal, , wavefre, , propage, , , , Fig 11.1 (b) are rac, Ray of, , Fig 11.1 (a), , » Wave front, , throug, , Wave, normal, , Fig 11.1 (c), , Wavefront:, A locus of all the points of the medi, which the waves reach simultaneously so that a, points are in the same phase is called wavefront., > Explanation:, 1. Consider point source ‘S’ of lig, , , , , , air., 2. The waves of li, travel in all possi b, 3. Ie’c’ tl, will cover a distanc®xct’., 4. Take oo, and, 5. Such a_ surface Ans, , wavefront., , Q.5. State & define diffgrent types of, wavefront. :, Ans: There are three types of wave fronts: =, 1, Spherical wavefront:, , A wavefront originating from a point source, of light at finite distance is called as spherical, wavefront., 2. Plane wavefront:, , At a very large distance from a point source, of light, small part of a spherical wavefront is plane, and it is called as plane wavefront., , The light from the sun reaches the, surface of earth in the form of plane wavefront., , 3. Cylindrical wavefront:, , =<