White light passes from water to air, with an incident angle of 32.1 deg. At what distance should you place a screen from the water surface so that the colours red (660 nm) and blue (470 nm) make bright spots that are 1.00 mm apart? For water, n = 1.331 for 660 nm light and n = 1.338 for 470 nm light. Report your answer in units of mm.

White light passes from water to air, with an incident angle of 32.1 deg. At what distance should you place a screen from the water surface so that the colours red (660 nm) and blue (470 nm) make bright spots that are 1.00 mm apart? For water, n = 1.331 for 660 nm light and n = 1.338 for 470 nm light. Report your answer in units of mm.