CAPE Physics Unit 1 · 2008 (Rest of Region) · Paper 1 · Question Q27
When monochromatic light of wavelength 6.0 \times 10^{-7}\text{ m} is incident normally on a plane diffraction grating, the angle between the two second order diffraction lines formed is 40^\circ. What is the number of lines per millimetre of the grating?
- (A)187
- (B)285
- (C)350
- (D)536
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