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3.2.2 Refraction of light

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Question 31

For light to undergo total internal reflection, it must travel from a medium with refractive index n1 n_1\,n1​ towards a medium with refractive index n2n_2n2​, with an angle of incidence θi\theta_iθi​. Let θc \theta_c\,θc​ be the critical angle.

Which of the following sets of conditions is necessary for total internal reflection to occur?

A

n1<n2n_1 < n_2n1​<n2​ and θi<θc\theta_i < \theta_cθi​<θc​

B

n1<n2n_1 < n_2n1​<n2​ and θi>θc\theta_i > \theta_cθi​>θc​

C

n1>n2n_1 > n_2n1​>n2​ and θi<θc\theta_i < \theta_cθi​<θc​

D

n1>n2n_1 > n_2n1​>n2​ and θi>θc\theta_i > \theta_cθi​>θc​

Markscheme

3.2.2 Refraction of light Questions

  1. IGCSE
  2. /Physics
  3. /3.2.2 Refraction of light

100 exam-style questions on CIE IGCSE Physics 3.2.2 Refraction of light. Each one has a worked solution and a mark scheme showing where the marks go.

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