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May 26, 2015

Homework Help: physics

Posted by physics on Saturday, March 14, 2009 at 12:56pm.

Monochromatic light from a helium-neon laser (wavelength=632.8 nm) shines at a right angle onto the surface of a diffraction grating that contains 130 960 lines/m. Find the angle at which one would observe the first-order maximum.

formula: (a+b)Sin theta = n wavelength
(a+b) = 1
____ m; n=1

wavelength=632.8*10^-9 m
=6.328*10^-7m

Sin theta=6.32^8 * 10^-7 * 130960
= 6.328*10^-7*130960*10^5
theta= 4.7536deg
= 4.75

is this done correctly?
130960

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