Diffraction Grating Question Watch

ombtom
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A diffraction grating is designed with a slit width of 0.83 micro-metres. When used in a spectrometer to view light of wavelength 430 nano-metres, diffracted beams are observed at angles of 14° 55' and 50° 40' to the zero order beam.

Explain why there is no diffracted beam between the observed beams.

(This is part b. Part a asked for the number of lines per mm on the grating, which is 599.)
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Duskstar
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(Original post by ombtom)
A diffraction grating is designed with a slit width of 0.83 micro-metres. When used in a spectrometer to view light of wavelength 430 nano-metres, diffracted beams are observed at angles of 14° 55' and 50° 40' to the zero order beam.

Explain why there is no diffracted beam between the observed beams.

(This is part b. Part a asked for the number of lines per mm on the grating, which is 599.)
What's you question?

It would be more helpful with the paper, but from what I think you're asking, the answer is that the different sources of the wave are destructively interfering because they are out of phase, and you only see beams at points where waves are out of phase by an integer number of wavelengths.
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