Physics Question about Diffraction Gradings

  • Thread starter tnbstudent
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  • #1
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Question:
What is the highest order of interference maximum that can occur when monochromatic light with a wavelength of 560 nm illuminates a diffraction grating with 4000 lines/cm?

Attempt:
I thought this seemed really easy, but my answer was incorrect.
λ=560nm
Since there are 4000 lines per centimeter - I solved for the distance between two slits to be 2.5*10^-6 meters.
Using I=mλ/d and m=1 to to achieve the max I got 0.224 but that was incorrect

I think I've made a silly error but I'm not sure what it is - can someone point me in a direction
 

Answers and Replies

  • #2
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The max number of orders is d/λ which must be rounded down if it is not a whole number
 
  • #3
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Thank you!
 

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