Diffraction grating

  • Thread starter cyclonefb3
  • Start date
  • #1

Homework Statement



A laser is used to illuminate a diffraction grating that has spacing of 637 lines per mm. The grating sits 11.6 cm in front of a screen. Find the distance to the first and second maxima (y1 and y2) for the laser wavelength of 643 nm. Express your answers in mm.

Homework Equations



wavelength = (s/m)(ym/sqrt(L2+ym2))

The Attempt at a Solution



s = 1/637 = .00156 mm
L = 116 mm
wavelength = 643 X 10-6 mm

I tried solving this equation for ym, but the answer I got was wrong. Is there another way to do this problem?
 

Answers and Replies

  • #2
alphysicist
Homework Helper
2,238
2
Hi cyclonefb3,

What answers did you get?
 
  • #3
I got 116 mm for both.
 
  • #4
alphysicist
Homework Helper
2,238
2
I got 116 mm for both.

Can you show the details of how you got those two answers (what numbers you used and so forth)? I'm not getting that from your equation.
 

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