Red light of wavelength 625 nm is incident normally on an optical diffraction grating with lines/m. Including central principal maxima, how many maxima may be observed on a screen which is for from the grating?
Red light of wavelength 625 nm is incident normally on an optical diffraction grating with lines/m. Including central principal maxima, how many maxima may be observed on a screen which is for from the grating?
For principal maxima in grating spectra
Where, is the order of principal maxima and
is the angle of diffraction.
Number of maxima
By a monochromatic wave, we mean |
|||
a) |
A single ray |
b) |
A single ray of a single colour |
c) |
Wave having a single wavelength |
d) |
Many rays of a single colour |
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