Verified Solution • 2025–26 Session moderate

QNEET-2018-Ph-900: NEET 2018 Physics - Class 12 NEET-2018-Ph-900 Solution: Unpolarised light is incident from air on a plane surface of a…

Unpolarised light is incident from air on a plane surface of a material of refractive index μ\mu. At a particular angle of incidence i it is found that the reflected and refracted rays are perpendicular to each other. Which of the following options is correct for this situation? Reflected light is polarised with its electric vector parallel to the plane of incidence Reflected light is polarised with its electric vector perpendicular to the plane of incidence i=sin⁡−1(1μ)i = \sin^{-1}(\frac{1}{\mu}) i=tan⁡−1(1μ)i = \tan^{-1}(\frac{1}{\mu})

Multiple Choice Options

  • A Reflected light is polarised with its electric vector parallel to the plane of incidence
  • B Reflected light is polarised with its electric vector perpendicular to the plane of incidence
  • C i=sin⁡−1(1μ)i = {\sin ^{ - 1}}\left( {{1 \over \mu }} \right) i = sin _ 1 ( _ 1 _ )
  • D i = tan -1 (1μ)\left( {{1 \over \mu }} \right) ( _ 1 _ )

Step-by-Step Verified Solution

If reflected and refracted light rays are perpendicular, reflected light gets polarised with electric field vector perpendicular to the plane of incidence. Also, tan i = _ (i = Brewster's angle)

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