At what angle of incidence,the light reflecte | vedclass

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(C) For light to be completely polarised by reflection,the reflected ray and the refracted ray must be mutually perpendicular.According to Brewster's

Vedclass · Accepted Answer

$56.4$

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(C) For light to be completely polarised by reflection,the reflected ray and the refracted ray must be mutually perpendicular.According to Brewster's Law,at the polarising angle $i_p$,the angle of incidence $i$ and the angle of refraction $r$ satisfy the condition $i + r = 90^{\circ}$.Given the angle of refraction $r = 33.6^{\circ}$.Therefore,$i + 33.6^{\circ} = 90^{\circ}$.$i = 90^{\circ} - 33.6^{\circ} = 56.4^{\circ}$.Thus,the angle of incidence is $56.4^{\circ}$.

At what angle of incidence,the light reflected from a glass slab will become completely polarised,if the angle of refraction at that incident angle is $33.6^{\circ}$ (in $^{\circ}$)?

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