Physics (AS & A Level) · May / June 2023 · Paper 12 · Question 29

Green light of wavelength 550 nm is incident normally on a diffraction grating and produces a diffraction pattern on a screen placed 3.5 m from the diffraction grating. The third-order maximum on the screen is a distance of 0.75 m from the zeroth-order (central) maximum. [diagram: screen, 3.5 m, 0.75 m, green light, diffraction grating, third-order maximum, zeroth-order (central) maximum, NOT TO SCALE] What is the distance between two adjacent slits in the diffraction grating?

1. A2.6 \times 10^{-6}\ \text{m}
2. B7.7 \times 10^{-6}\ \text{m}
3. C7.9 \times 10^{-6}\ \text{m}
4. D1.0 \times 10^{-5}\ \text{m}

As printed in the paper