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Unpolarised light is incident on a plane glass surface. What would be the angle of incidence so that the reflected and refracted rays are perpendicular to each other. |
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Answer» Solution :Here, reflected and refracted light rays are given perpendicular and so angle of incidence (1) must be equal to polarising angle or Brewster angle shown by symbol `theta_(p)`. Now, according to Brewsters. law, `tantheta_(P)=mu` `:.tantheta_(P)=1.5` `("":."Here "mu-mu_(ga)-(mu_(g))/(mu_(a))=(1.5)/(1)=1.5)` But `tan(56^(@)19.)=1.5003~~1.5` `impliestheta_(P)=56^(@)19.` NOTE: Here if `theta_(P)` is REQUIRED only in degree then `theta_(P)=56^(@)+19.=56^(@)+((19)/(60))^(@)` `=56^(@)+(0.32)^(@)` `=(56.32)^(@)` |
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