Q1. A) Two slits are 0.450 mm apart
and 75.0 cm from a screen. What is the distance between
the second and third dark lines of the interference pattern on the
screen when the slits are illuminated with coherent light with a
wavelength of 500 nm?
B) If the entire set-up is now placed in water,
what will be the distance between the second and third dark
lines?
I understand part A but am a little confused on how to...