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Light traveling in a medium of index of refraction n1 is incident on another medium having an index of refraction n2. Under which of the following conditions can total internal reflection occur at the interface of the two media? (Select all that apply.)

a)The indices of refraction have the relation n2 > n1.

b)The indices of refraction have the relation n1 > n2.

c)Light travels slower in the second medium than in the first.

d)The angle of incidence is less than the critical angle.

e)The angle of incidence must equal the angle of refraction.

Verified Answer :

osprey2015

b, the light should be travelling out of the optically dense medium to the optically less dense medium.
were d to read "... is greater than the critical angle" I'd agree with it. But it doesn't read that way ...
Which leaves b as the only one which I think is true. Which I find a bit odd.
Out of interest, TIR is often used in piping light down optical fibres, among many other applications.

onyebuchinnaji

The condition for total internal reflection to occur at the interface of the two media is the indices of refraction have the relation n1 > n2.

Total internal reflection is the reflection of an incident ray of light at the interface between the medium of incidence and another medium of lower refractive index when the angle of incidence in the denser medium exceeds the critical angle.

Two conditions for total internal reflection;

  • Light must be travelling from an optically more dense to an optically less dense medium (n₁ > n₂),
  • The angle of incidence in the denser medium must be greater than the critical angle.

Thus, from the given options, the only condition that matches the above two conditions is the indices of refraction have the relation n1 > n2.


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