What is the lowest m where 520 nm light disappears in a 6000 lines/cm grating?

[quickslant]

Lights with wavelengths of 520 nm and 630 nm passess through a diffraction grating that contains 6000 lines/cm or 600000 lines/m

what is the lowest value of m for which the 520 nm line no longer exists?

 

[quickslant]

where do i start with this...

 

[Kurdt]

Do you know any equations relating to diffraction gratings?

 

[quickslant]

sin theta(m) = m(wavelength)/ d

 

[Kurdt]

Well all you have to do is find out how many orders you can get for that wavelength. You know when it disappears when $$\theta_m$$ is greater than 90 degrees.

 

[quickslant]

thank you very much..