A beam of light passes from air into a substance z. If the angle of incidence be 60 degree and the angle of refraction be 30 degree, what will be the refractive index of substance z?
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Explanation:
sin i / sin r= constant,where i is angle of incidence and r is angle of refraction. This law is known as Snell's law of refraction.
The constant value is called refractive index of second medium with respect to first.
sin 60°/sin 30°
√3/2 / 1/2
√3 or 1.73 (approx. value of √3) is the refractive index
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