Double slits experiment, wavelength calculation

[alsaadawi]

Homework Statement

In a double slit experiment with slits 1. 10-5 m apart, light casts the first bright band 3.10-2 m from the center of a screen 0.65 m away what is the wavelength ?

Homework Equations

dsin(theta) = (m +1/2)lambda,

The Attempt at a Solution

I think to solve this problem I need the angle more to apply this formula

dsin(theta) = (m +1/2)lambda,

am I right, or maybe we can solve it without the angle ?

Thanks in advance

 

[truesearch]

If you know the distance to the screen and the distance to the first fringe from the centre line then you have the angle information

 

[alsaadawi]

If you know the distance to the screen and the distance to the first fringe from the centre line then you have the angle information

Yess sure, thank you.