Question

A ray of light is incident at an angle i from denser to
rare medium. The reflected and the refracted rays are
mutually perpendicular. The angle of reflection and
the angle of refraction are respectively r and r', then
the critical angle will be

Answer 1

Answer:

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Explanation:

as the reflected and refracted rays are 90 then the angle of refraction is 90−i

according to Snell's law

siniμ

r

=sin(90−i)

μ

r

=coti

critical angle is sin

−1

μ

r

1

=sin

−1

coti

1

=sin

−1

tani