Question

А
parallel beam of monochromatic light is allo
wed to be incident
normally on a plane grating having 1250 line
s per cm and a second order spectral line is
observed to be deviated through 30°.
Calculate the wavelength of the spectral line.
A) 2.5 x 10-5 cm
B
2 x 10-3 cm
С
2 x 10-4 cm
D) 3.9 x 10-6 m​

Answer 1

Answer:

D) 3.9 x 10-6 m​

Explanation:

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