2. A green laser beam ($\lambda$ = 532 nm in air) is incident on a double slit, creating an interference pattern of bright and dark spots on a screen some distance away. If you want the spots in the pattern to be closer together which of the following changes could you make? Select all that apply.
Replace the green laser by a red laser.
Replace the green laser by a violet laser.
Increase the distance between the two slits.
Decrease d, the distance between the two slits.
Decrease the distance between the double slit and the screen.
Immerse the entire apparatus in water.