February/March 2026 Paper 12

2026 · 40 questions · 40 parts · 40 marks

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31Diffraction Diffraction GratingsHard1 mark
Laser light of a single frequency is incident normally on a diffraction grating with lines m. A diffraction pattern is formed on a flat screen which is parallel to the grating. The screen is a distance of 33.5 cm from the grating. The distance between the two first-order intensity maxima is 15.0 cm. What is the wavelength of the light?