Red light of wavelength 640 nm is incident normally on a diffraction grating having a line spacing of 1.7 × 10⁻⁶m, as shown in Fig. 5.1.
[Figure 5.1]
The second order diffraction maximum of the light is at an angle θ to the direction of the incident light.

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Red light of wavelength 640 nm is incident normally on a diffraction grating having a line spacing of 1.7 × 10⁻⁶m, as shown in Fig. 5.1. [Figure 5.1] The second order diffraction maximum of the light is at an angle θ to the direction of the incident light.

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