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A light beam is traveling through an unknown substance. When it exits that substance and enters into air, the angle of reflec

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Answer #1

here,

the angle of reflection = 28 degree

the angle of incidence , i = angle of reflection

i = 28 degree

the angle of refraction , r = 45 degree

let the index of refraction be n

using snell's law

n /1 = sin(r) /sin(i)

n = sin(45) /sin(28)

n = 1.51

the index of refraction of substance is 1.51

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