A grating with 320 slits/centimeter is illuminated with light of wavelength 493 nm. (a) What is...
A grating with 320 slits/centimeter is illuminated with light of wavelength 493 nm.
(a) What is the highest order number that canbe observed with
this grating?
(b) Repeat for a grating of 1376 slits/centimeter.
Homework Answers
1/320 means that each slit has a length of 3.125x10^-3 cm
dsintheta = m lamba
sin theta = mlamba / d
We try values of m until mlamba/d is > 1
493x10^-9/3.125x10^-3
This should work up to m=1.576*10^-4
B)
1/1376 means that each slit has a length of 7.267x10^-4 cm
dsintheta = m lamba
sin theta = mlamba / d
We try values of m until mlamba/d is > 1
493x10^-9/7.267x10^-4
This should work up to m=6.78*10^-4
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