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What is the index of refraction of a medium if the critical angle is 40.0°, assuming the second medium is air?

Respuesta :

Answer:

n = sin r/sin c = sin 90°/ sin 40° = 1/0.6428= 1.5557 ≅ 1.56

Explanation:

The refractive index of a medium (n) is defined as angle of refraction per angle of incidence. When the angle of incidence in water reaches a certain critical value, the refracted ray lies along the boundary, having an angle of refraction of 90-degrees. This angle of incidence is known as the critical angle which was given to us; 40.0°.  Then we subtitute the value in the equation to get the R.I of the medium.

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