Two slits separated by a distance of d=0.175 mm are located at a distance of D=1.61 m from a screen. The screen is oriented parallel to the plane of the slits. The slits are illuminated by a monochromatic and coherent light source with a wavelength of y= 609 nm. A wave from each slit propagates to the screen. The interference pattern shows a peak at the center of the screen (m=0) and then alternating minima and maxima.
What is the path length difference between the waves at the second maximum (m=2) on the screen? (in mm)
At what angle from the beam axis will the second (m=2) maximum appear? (you can safely use the small angle approx) in deg