b) Light of wavelength 450nm is incident on a diffraction grating on which 7000 lines/cm have been ruled. How many orders of spectra cab be observed on either side of the direct beam?

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b) Light of wavelength 450nm is incident on a diffraction grating on which 7000
lines/cm have been ruled. How many orders of spectra cab be observed on either
side of the direct beam?
Transcribed Image Text:b) Light of wavelength 450nm is incident on a diffraction grating on which 7000 lines/cm have been ruled. How many orders of spectra cab be observed on either side of the direct beam?
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