Question

A monochromatic light illuminates a double slits system with a slit separation, d =0.3 mm. The maximum of the first order occurs at y = 4.0 mm on a screen placed at 1.0 m from the slits. Find the:
a)Wavelength
b)Distance between the central maximum and the minimum of the third order on the screen.
c)Separation between third maxima and first minima
d)Angle between third maxima and first minima.