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3.2 Light

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Question 84

A ray of light travels through a medium of refractive index n1 n_1\,n1​ towards a boundary with a second medium of refractive index n2n_2n2​. Under what conditions will the ray undergo total internal reflection at the boundary, where θc \theta_c\,θc​ represents the critical angle?

A

n1>n2n_1 > n_2n1​>n2​ and the angle of incidence is less than θc\theta_cθc​

B

n1<n2n_1 < n_2n1​<n2​ and the angle of incidence is greater than θc\theta_cθc​

C

n1>n2n_1 > n_2n1​>n2​ and the angle of incidence is greater than θc\theta_cθc​

D

n1<n2n_1 < n_2n1​<n2​ and the angle of incidence is less than θc\theta_cθc​

Markscheme

3.2 Light Questions

  1. IGCSE
  2. /Physics
  3. /3.2 Light

216 exam-style questions on CIE IGCSE Physics 3.2 Light, covering 3.2.1a Reflection of light, 3.2.1b Images in a plane mirror, 3.2.2 Refraction of light, 3.2.2a Refraction of light, 3.2.2b Total internal reflection, 3.2.2c Refractive index and critical angle, 3.2.2d Optical fibres, 3.2.3a Converging and diverging lenses, 3.2.3b Ray diagrams and the nature of images, 3.2.3c Virtual images and the magnifying glass, 3.2.3d Correcting long-sightedness and short-sightedness, and 3.2.4 Dispersion of light. Each one has a worked solution and a mark scheme showing where the marks go.

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