Light passes through a pair of narrow slits with a 0.67-mm separation. It is found that the fourth bright fringe makes an angle of 0.19° with the normal. What is the light's wavelength in nanometers? Answer in nanometers

The wavelength of the light is 555 nm.

Explanation:

according to Bragg's law ...

n*λ = d*sin (θ)

n is the fringe number

λ is the wavelength of the light

d is the slit separation

θ is the angle the light makes with the normal at the fringe.