To assess a possible transparent cover for a light sensor, a technician varied the direction of a light ray before it entered the material. The resulting angles are shown below; air was outside the cover and each angle was measured from the normal.
| Angle of incidence | Angle of refraction |
|---|---|
| 15∘15^\circ15∘ | 10∘10^\circ10∘ |
| 35∘35^\circ35∘ | 23∘23^\circ23∘ |
| 55∘55^\circ55∘ | 34∘34^\circ34∘ |
| 75∘75^\circ75∘ | 42∘42^\circ42∘ |
What happens to the difference between the angle of incidence and the angle of refraction as the angle of incidence increases?
The difference gets smaller.
The difference first decreases then increases.
The difference gets larger.
The difference first increases then decreases.
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.