Question

An angle of refraction of prism is 60 ,a ray incident on its face and angle is rotate ,angle of minimum deviations is 40 then refractive index of prism

Answer 1

refractive index= sin i/sin r
ang. dev. = 180 - 2( ang. of inc.)
and. of inc= 40-180/-2=70

now angle of incidence
= 2sin70/√3

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