A beam of monochromatic light is incident on a plane transmission gra – McqOptions

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1.	A beam of monochromatic light is incident on a plane transmission grating having 5000 lines/cm and the second order spectral line is found to be diffracted at 30°. The wavelength of the light is _______
A.	4000 Å
B.	5000 Å
C.	6000 Å
D.	7000 Å
Answer» C. 6000 Å

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