Two lasers are shining on a double slit, with slit separation d. Laser 1 has a wavelength of d/20, whereas laser 2 has a wavelength of d/15. The lasers produce separate interference patterns on a screen a distance 4.90 meter away from the slits.
Part A: Find the distance between first maxima (on the same side of the central maximum) of the two patterns? Express your answer in meters.
Part B: Find the distance between the second maximum of laser 1 and the third minimum of laser 2, on the same side of the central maximum?