Question

A grating has 800 lines per centimeter.

Find the angles of the first three principal maxima above the central fringe when this grating is illuminated with 657nm light.

Enter your answers numerically separated by commas.

Answer 1

lem=800 slits I = 1.25 x 10 23 cm 800 d- = 1-25 x 10 xlo'm. sino = ηλ O = sin land) (m=1,2,3,---). } 0,= sint in / X657x100 = sin-Y0.05257) – 3.0128° 1.25 x 10-5 og 2X 6578109 O3 = sint 1.25x105 hones ) sin0-105 12) = 6.034 *( 3465381039 ) = sin(0.15768) = 3.0922