A beam of light travels from air into a glass block. Refraction is observed at the boundary.
What is the primary cause of this refraction?
The light waves change frequency as they enter the glass.
The light waves travel at different speeds in air and glass.
The light waves are reflected from the surface of the glass block.
The light waves undergo diffraction as they enter the glass.
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.