how do you calculate the angle of a wavelength given wavelength of the light, distance between slits and distance to screen?

Question

anonymous · Answer

$$\theta = \frac{ \lambda }{ d }$$

anonymous · Answer

Where d is the distance between the slits.

hugsnotughs · Answer

I think @IhteshamMalik is correct...do you need help knowing what the symbols mean?

hugsnotughs · Answer

λ is the wavelength, θ is the angle of deviation of the spectral line, and d is the distance between the slits or the "grating space".

anonymous · Answer

Constructive interference:
$$\sin \theta = \frac{m \lambda}{d}$$
where:    $m = 0, \pm1, \pm2, ...$

anonymous · Answer

Thanks guys. I'm still confused because how do you know the value for m?

anonymous · Answer

These are the values I was given. The wavelength of the light is 650. The distance between the slits is 90. The distance to the screen is 400.