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## 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)(y

_{m}/sqrt(L

^{2}+y

_{m}

^{2}))

## 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 y

_{m}, but the answer I got was wrong. Is there another way to do this problem?