73. A diffraction grating has 500 lines per millimetre. When a parallel beam of light is incident normally on the grating, the angular separation between the two second order maxima is 60°. What is the wavelength of the incident beam? A. 200 nm B. 400 nm C. 500 nm D. 600 nm

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73. A diffraction grating has 500 lines per millimetre. When a parallel beam of light is incident normally on
the grating, the angular separation between the two second order maxima is 60°. What is the wavelength
of the incident beam?
A. 200 nm
B. 400 nm
C. 500 nm
D. 600 nm
Transcribed Image Text:73. A diffraction grating has 500 lines per millimetre. When a parallel beam of light is incident normally on the grating, the angular separation between the two second order maxima is 60°. What is the wavelength of the incident beam? A. 200 nm B. 400 nm C. 500 nm D. 600 nm
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