A-LevelPhysicsSuperposition9702/12 · Oct/Nov 2020 · Q301 Mark
Light of a single frequency is incident on a diffraction grating. Seven bright spots are observed on a screen. Which change will result in an increase in the number of bright spots observed?
AIncrease the distance between the grating and the screen.
BIncrease the frequency of the incident light.
CIncrease the intensity of the incident light.
DIncrease the number of lines per metre in the grating.
✓ Correct answer
B: Increase the frequency of the incident light.
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