8.1 All types of waves undergo diffraction.
8.1.1 Define the term diffraction. (2)
8.1.2 State the condition necessary for diffraction to occur in a single slit. (2)
8.2 Light of wavelength 460 nm passes through a single slit of width 7 x 10-6 m.
A diffraction pattern is observed on a screen, as shown in the diagram below.
8.2.1 Describe the pattern observed on the screen. (2)
8.2.2 Describe how each of the following changes will affect the width (broadness) of portion X in the diagram above:
(a) Light of wavelength 470 nm is used while the slit width is kept
constant (1)
(b) The slit width is changed to 7 x 10-7 m while the original
wavelength is left unchanged (1)
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