Question

# A diffraction grating with 600 lines/mm is illuminated with light of wavelength 510 nm. A very...

A diffraction grating with 600 lines/mm is illuminated with light of wavelength 510 nm. A very wide viewing screen is 4.2 m behind the grating.

Part A

What is the distance between the two m = 1 bright fringes?

Δy =

Part B

How many bright fringes can be seen on the screen?

N =

(A) d = 1 x 10^-3 m / 600 = 1.67 x 10^-6

y = m lambda D / d

y = (1 x 510 x 10^-9 x 4.2) / (1.67 x 10^-6)

y = 1.2852 m

d = 2 y = 2.57 m

(B) sin(theta) = m lambda / d

sin90 = m (510 x 10^-9) / (1.67 x 10^-6)

m = 3.26

total bright fringe = 2(3) + 1 = 7

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