Explain what is meant by the term critical angle in the context of refraction.
State two conditions required for light to be totally internally reflected.
Endoscopes are medical devices that use optical fibres. Describe and explain how optical fibres are used to transmit light into and out of a patient's body to obtain a visual image of an internal organ.
100 exam-style questions on CIE IGCSE Physics 3.2.2 Refraction of light. Each one has a worked solution and a mark scheme showing where the marks go.