Blue light of wavelength 485.6nm from a star is incident normally on a diffraction grating. The light is diffracted into a number of beams, as shown in Fig 5.4.(attached)
The angular separation of the two second-order beams is 45.72 degrees.
Calculate the number of lines per millimetre on the grating.
The Attempt at a Solution
I genuinely do not know where to start the question. I know the formula for Young's double slit experiment however this does not seem to relate to it at all. Any suggestions for starting the question would be really appreciated.
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