(a)[1]
A laser emits a beam of monochromatic light. State what the term monochromatic means.
(b)[6]
The wave is reflected and refracted at the air-glass boundary. On Fig. 7.1 draw: (i) the wavefronts of the reflected wave (ii) the wavefronts of the refracted wave.
(c)[2]
In the space below, sketch a diagram that shows how the rope looks as the wave moves along it. Label two key features of the wave.