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a ray of light falls on a glass slab of refractive index u.if the reflected and refracted rays are mutually perpendicular to each other,find the angle of incidence.
let i be angle of incidence then angle of reflection is i ,by snell law sin i=usin r
90-i+90-r=90
i+r=90
putting in above eqn.
u=
tan i
Please find the answer in the attached file
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