Find the absolute value of theta 650-theta 420

[ahazen]

Two rays of light of wavelength 650 nm and 420 nm are normally incident on a different grating. If the grating has 5000 slits/cm, what is the angular separation of of the two light rays' second order maximum.

-Need to find the absolute value of theta 650-theta 420

I know I need to use the formula d*sin(theta) = m*lambda to find each of the angles in degrees -- then subtract

Please help me:):)

Thank you:)

 

[Redbelly98]

I know I need to use the formula d*sin(theta) = m*lambda to find each of the angles in degrees -- then subtract

Yes, exactly. What is it that you don't understand? Just plug in the values for d, m, and λ to figure out what θ is.

 

[ahazen]

oh, ok:) it makes sense now:) thank you:)