Physics (AS & A Level) · Oct / Nov 2025 · Paper 14 · Question 30
A parallel beam of red light of wavelength 700 nm is incident normally on a diffraction grating that has 400 lines per millimetre. What is the total number of intensity maxima from the grating?
- A6
- B7
- C8
- D9
As printed in the paper
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Correct answer: B. 7
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