A diffraction grating has 4000 lines/cm. The dispersive power of the – McqOptions

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1.	A diffraction grating has 4000 lines/cm. The dispersive power of the grating in the third order spectrum in the wavelength region of 5000 Å is _____________
A.	5000
B.	10000
C.	15000
D.	20000
Answer» D. 20000

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