please explain 40 A ray of light travelling in vacuum enters into a medium of refractive index It is found that angle of

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please explain 40 A ray of light travelling in vacuum enters into a medium of refractive index It is found that angle of refraction is half of the angle of incidence then value of angle of incidence is cos FIN 2 cos 2 sin 2 0 Solution Answer 2 Given 1 sini usinr 2 sin cos sin

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