Posted by physics on .
pleaase help me with this,
i'm very bad in physics, and i mostly don't understand any of this stuff...can anyone explain as well as show me how to do this
Monochromatic light from a heliumneon 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 firstorder maximum
Thank you VERY much! =]

physics 
bobpursley,
I know this is in your text. Are you studying your text, going through the examples? From your questions, I get the impression your are not, just looking for formulas to plug and compute. Physics is much more gedunken that that.
d * sinTheta= m * lambda
where d is line spacing (1/130860), m is the order (m1 here).