Light travels inside a transparent crystal ornament towards its boundary with air. The ornament is more optically dense than air, and the critical angle is 40∘40^\circ40∘.
| Path | Angle between ray and surface |
|---|---|
| A | 32∘32^\circ32∘ |
| B | 62∘62^\circ62∘ |
Which statement describes what happens to the light on paths A and B at the boundary?
path A: total internal reflection; path B: refraction into the air
path A: total internal reflection; path B: total internal reflection
path A: refraction into the air; path B: total internal reflection
path A: refraction into the air; path B: refraction into the air
93 exam-style questions on Edexcel GCSE Physics 5.1 Reflection, refraction and lenses, covering 5.1.1 Reflection, refraction and total internal reflection, 5.1.2 Specular and diffuse reflection, 5.1.3 Colour of light: absorption and filters, 5.1.4 Lenses: power, focal length and shape, 5.1.5 Ray diagrams for converging and diverging lenses, and 5.1.6 Real and virtual images. Each one has a worked solution and a mark scheme showing where the marks go.