Two beams of light are both the same colour of violet. One beam is travelling through a vacuum, while the other beam is travelling through a block of glass. The two beams have different intensities.
Which quantity is the same for both beams of light?
amplitude
speed
frequency
wavelength
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.