Physics (AS & A Level) · Oct / Nov 2023 · Paper 12 · Question 29
Light of wavelength 690 nm passes through a diffraction grating with 300 lines per mm, producing a series of bright spots (maxima) on a screen. What is the total number of bright spots that are produced?
- A4
- B5
- C8
- D9
As printed in the paper
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Correct answer: D. 9
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