Red light of wavelength 
is incident normally on an optical diff raction grating with 
lines 
. Including central principal maxima, how many maxima may be observed on a screen which is far from the grating?
Text Solution
Verified by ExpertsThe correct answer is:
B
: Here,
Wavelength, 
Number of lines per meter, 
For principal maxima in grating spectra
where 
is the order of principal maxima and 
is the angle of diffraction
The maximum value of 
is 1
Number of maxima 
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