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3.2 Light

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Question 110

A ray of light travels through a medium of refractive index n1 n_1\,n1​ towards a boundary with another medium of refractive index n2n_2n2​.

Which row correctly identifies the conditions required for total internal reflection to occur?

A

n1<n2n_1 < n_2n1​<n2​ and θ\thetaθ is less than the critical angle

B

n1<n2n_1 < n_2n1​<n2​ and θ\thetaθ is greater than the critical angle

C

n1>n2n_1 > n_2n1​>n2​ and θ\thetaθ is less than the critical angle

D

n1>n2n_1 > n_2n1​>n2​ and θ\thetaθ is greater than the critical angle

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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