Is this the right formula to use?

[linuxux]

Homework Statement

Not sure which equation to use?

600nm light falls on a single slit of width 0.015mm. What is the angular width of the central maximum?

Homework Equations

$$\Delta\theta = 2\left(\frac{\lambda}{slit width}\right)$$

is that the right equation to use?

 

[Doc Al]

Looks good to me. But to gain confidence, you should understand how it is derived.