A diffraction grating is labelled 300 lines mm^-1 (lines per mm) is put 120 cm from a screen. there is put white light on it.
The question is that i have to solve what the distance is between the m0 and the blue(450 nm) of m1.
my formula : sin(ø)=(n*λ)/d
The Attempt at a Solution
I think that u have to find the angel between m0 and m1 blue but i just dont get it..
i have tried to do it this way but seems that it keeps turning out wrong.
sin(ø) is the angle i have to find
n is 1 since i have to find the distance from 0 to 1
λ is the wavelength 450 nm
and d must be 300 lines/mm --> D=3,33*10^-6
but from here i see everything i have done like wrong and then i dont understand it anymore
please help me, and by the way i am new here so sorry if i didnt put the questions the right place or such im still trying to learn it