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3.2 Light

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Question 71

A ray of light passes from a block of plastic into air. The critical angle for this plastic is 40∘40^\circ40∘.

Which statement is correct?

A

The angle of refraction is always smaller than the angle of incidence.

B

If the angle of incidence is 30∘30^\circ30∘, total internal reflection occurs.

C

If the angle of incidence is 50∘50^\circ50∘, the ray is totally internally reflected.

D

The angle of incidence is the angle between the light ray and the surface of the plastic block.

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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