Finding Angles in a Double slit experiment

[jisbon]

Homework Statement

A point light source is used in a double-slit experiment. The light source contains 2 wavelengths (500nm and 600nm). Separation of the 2 silts is d=1mm. 2 sets of interference fringes are formed on the screen. Find the angles where the bright fringes are formed for both of the wavelengths.

Relevant Equations

$d\sin \theta =m\lambda$

Hello all!

Having some problems understanding this question.
From what I know, bright fringes means that there will be constructive interferences, whereby $d\sin \theta =m\lambda$
In this case, I know the d (separation of silts). However, what should I put in for wavelength? I went through some examples online and they all showed sources projecting the same wavelength. In cases of different wavelength like the one above, how should I proceed? Cheers

 

[mjc123]

Do two separate calculations, one for 500 nm and one for 600 nm. There will be two sets of fringes.

 

[jisbon]

Do two separate calculations, one for 500 nm and one for 600 nm. There will be two sets of fringes.

Thanks for the fast reply. What should I input for m? I understand that for bright fringes, m can be = 0,1,2,3.. etc. So in this case, how do I determine the value of m? Cheers

 

[mjc123]

It asks for angles (plural) but doesn't say how many. I would give values for m = 0, 1, 2 for each wavelength.

 

[jisbon]

Oh okay, thanks for the help