Answer Happy

Coherent light with wavelength 580 nm passes through narrows with a separation of 0.310 mm At a distance from the site which is large compared to their separation, what is the phase difference in radians) in the light from the two sits at an angle of 262" from the centerline? Express your answer in radians.

Part A Two slits spaced 0.440 mm apart are placed a distance of 70.5 cm from a screen What is the distance between the second and third dark lines of the interference pattern on the screen when the sits are luminated with coherent light with a wavelength of 470 m2 Express your answer in meters.