A student obtains the results in the table for light entering glass from air. All angles are measured from the normal.
| Angle of incidence | Angle of refraction |
|---|---|
| 20∘20^\circ20∘ | 13∘13^\circ13∘ |
| 40∘40^\circ40∘ | 25∘25^\circ25∘ |
| 60∘60^\circ60∘ | 35∘35^\circ35∘ |
Which conclusion is supported by all three results?
The angle of refraction increases and is always half the angle of incidence.
The angle of refraction increases and remains smaller than the angle of incidence.
The angle of refraction decreases and remains smaller than the angle of incidence.
The angle of refraction increases and differs from the angle of incidence by a constant amount.
84 exam-style questions on Edexcel GCSE Physics 5.2 The electromagnetic spectrum, covering 5.2.1 Electromagnetic waves and refraction in glass (core practical), 5.2.2 Groups of the electromagnetic spectrum, 5.2.3 Wavelength-dependent behaviour of EM waves, and 5.2.4 Velocities of EM waves in different substances. Each one has a worked solution and a mark scheme showing where the marks go.