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When light of a certain wavelength is incident on a plane surface of a material at a glancing angle 30^@ , the reflected light is found to be completely plane polarized Determine a) refractive index of given material and b) angle of refraction. |
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Answer» Solution :a) Angle of incident LIGHT with the surface is `30^@` . The angle of INCIDENCE = `90^@-30^@ = 60^@`. Since reflected light is completely polarized, incidence takes PLACE at polarizing angle of incidence `theta_p` ` therefore theta_p = 60^@ ` USING Brewster.s law `MU tan theta_p = tan 60^@ rArr mu = sqrt3` b) From snell.s law `mu = (sin i)/(sin r) , therefore sqrt3 = (sin 60^@)/(sin r)` orsin ` = (sqrt3)/(2) xx (1)/(sqrt3) = 1/2 , r = 30^@` |
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