Question

JEE mains Previous year question chapter :- Geometrical Optics​

Answer 1

Answer:

D is the correct option

Explanation:

Answer is in the attachment

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Answer 2

Answer:

let iₚ be the angle of incidence at which reflected light is totally polarised for reflection from air to glass.

refractive index of glass = n (given)

and

r = 90-iₚ

By Snell's law :-

1×sin(iₚ) = n×sinr

→ sin(iₚ) = nsin(90-iₚ)

→ sin(iₚ) = ncos(iₚ)

→ tan(iₚ) = n

→ iₚ =

${ \tan }^{ - 1}( n)$