Double slit diffraction approximated with:
ym = mλD/d (d is separation between slits)
Single slit diffraction:
ym = mλD/d (d is width of slit)
(a) Wavelength increases: ym is directly proportional to λ, so...
What happens to a pattern of diffraction when you:
a. Increase the wavelength (for double slit and single slit pattern)?
b. Slits are moved apart (for double-slit pattern)?
c. Each slit is widened (for single slit pattern)?