The red light from a laser has a single wavelength, so it is monochromatic.
(a)[1]
State the meaning of monochromatic.
(b(i))[2]
Explain why the red light keeps the same direction as it enters the plastic block.
(b(ii))[4]
Calculate the speed of the red light in the plastic.
(b(iii))[3]
Explain what happens to the blue light after it reaches the straight edge at M.
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