Coherent light with wavelength 500nm shines on a double slit with a screen 1.90m behind it. if the distance between the dark fringes is 3.30mm, what is the separation of the slits?

Explanation:

λ = wavelength of the coherent light = 500 nm = nm

D = distance of the screen = 1.90 m

w = distance between dark fringes = 3.30 mm = m

d = separation of the slits

distance between dark fringes is given as

the device is called “ rocket engine”