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3.2 Light

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Question 80

For light to undergo total internal reflection, it must travel from a medium with refractive index $n_1\,$ towards a medium with refractive index $n_2$ , with an angle of incidence $θi\theta_i$ . Let $\theta_c\,$ be the critical angle.

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

A

$n_1 < n_2$ and $θi<θc\theta_i < \theta_c$

B

$n_1 < n_2$ and $θi>θc\theta_i > \theta_c$

C

$n_1 > n_2$ and $θi<θc\theta_i < \theta_c$

D

$n_1 > n_2$ and $θi>θc\theta_i > \theta_c$

Markscheme

3.2 Light Questions

IGCSE
Physics
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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