May/June 2026 Paper 12

2026 · 40 questions · 40 parts · 40 marks

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27Diffraction Diffraction GratingsHard1 mark
The diagram shows a beam of light of wavelength that is incident normally on a diffraction grating.
diagram of a beam of light of wavelength lambda X incident normally on a diffraction grating; two second-order intensity maxima leave the grating symmetrically, each at 45 degrees to the direction of the incident beam
The diagram shows only the second-order intensity maxima that are produced at an angle of to the direction of the incident beam of light. A replacement beam of light of a different wavelength is now incident normally on the diffraction grating. This new wavelength also produces intensity maxima that are at an angle of to the direction of the incident beam of light. What is a possible value of the ratio ?