Diffraction Grating wavelengths

[rojasharma]

light wavelengths of 520nm and 630nm passes through a diffraction grating that contains 6000lines/cm. a) sketch a diagram of the image produced from m=0 to m=2. label the order of each fringe.b) calculate the angles for the first and second-order maxima that would appear on the screen. c) What is the lowest value of m for which the 520-nm line no longer exists?

For part b...what wavlength do i use to find the angles for the first and second oreder maxima?...:S

 

[rojasharma]

can anyone help me ...please..

 

[mysqlpress]

Both.
They have different angles in both the first and second maxima.
c)
(10^-2/6000)sintheta =n(520*10^-9)
sintheta cannot exceed one
so calculate the n your own

you should calculate and do homework yourself.
I am to guide you, not to help u finish your homework

 

[rojasharma]

this is not my homework..It was my homework...but i got it wrong, unfortunately my teacher did not write the correct answer...as my exam is approching...i am preparing for it. I am doing this course through ilc, ilc tutors are not available right now because of the break, that's why i wanted to know the answer to this question.
So for part b) i am supposed to find the first and sec order maxima for both wavelengths?...i see now that's why i got it wrong in first place.