A pulse of ultraviolet radiation travels through air towards the boundary with a transparent solid. It meets the boundary at an angle to the normal. Its frequency remains unchanged as it enters the solid, and its speed in the solid is lower than in air.
Which row correctly describes the radiation’s direction and wavelength after it enters the solid?
It bends away from the normal, and its wavelength decreases.
It does not change direction, and its wavelength decreases.
It bends towards the normal, and its wavelength decreases.
It bends towards the normal, and its wavelength increases.
93 exam-style questions on AQA GCSE Physics 6.2 Electromagnetic waves, covering 6.2.1 Types of electromagnetic waves, 6.2.2 Properties of electromagnetic waves 1, 6.2.3 Properties of electromagnetic waves 2, 6.2.4 Uses and applications of electromagnetic waves, 6.2.5 Lenses, and 6.2.6 Visible light. Each one has a worked solution and a mark scheme showing where the marks go.