Physics (AS & A Level) · Oct / Nov 2018 · Paper 22 · Question 5

Red light of wavelength 640 nm is incident normally on a diffraction grating having a line spacing of 1.7 × 10–6 m, as shown in Fig. 5.1. diffraction grating incident light wavelength 640 nm second order second order first order first order zero order θ Fig. 5.1 (not to scale) The second order diffraction maximum of the light is at an angle θ to the direction of the incident light.

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