Question

Monochromatic light of wavelength 550 nm passes through a diffraction grating that has 55000 lines/m. A bright line appears on the screen at an angle of 12.23o from the central bright fringe. What is the order of this bright line?

5
6
7
8

Answer 1

dsin12.23 = ml, m = 0, 1, 2, ….`

where l = 550 * 10^-9 m
d = 1/55000

solve for m

Answer 2

where's the rest

Answer 3

such a teacher