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The refractive index of the medium M in the…

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PHYSICS

The refractive index of the medium M in the diagram above is

The refractive index of the medium M in the diagram above is

A. 2/√3

B. √3

C. 1/√3

D. √3/2

QUICK ANSWER…

B

DETAILS…

Refractive index of a medium is the ratio of the sine of angle of incidence to the sine of angle of refraction as light ray travels from space to the medium.

Mathematically,

Refractive index = sine i / sine r

  • Angle of incidence will be the angle the incident ray makes with the vertical line (also called the normal) = 60°
  • Angle of refraction will be the angle the refracted ray makes with the vertical = (90 – 60) = 30°
The refractive index of the medium M in the diagram above is

Now for the right answer to the above question:

  1. Option A is incorrect.
  2. Option B is correct.
  3. C is incorrect.
  4. D is not the correct answer.
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KEY POINTS…

You may please note these/this:

  • Angle of incidence will be the angle the incident ray makes with the vertical line (also called the normal), and not the horizontal line. this angle of incidence = 60 degrees.
  • Angle of refraction will be the angle the refracted ray makes with the vertical = (90 – 60) = 30 degrees.
  • Refractive index of air can also be calculated by inverting that of the medium.

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/ culled from 2016 JAMB-UTME physics past question 16 /

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