Double slit diffraction approximated with:

**y _{m} = mλD/d** (d is separation between slits)

Single slit diffraction:

**y _{m} = mλD/d** (d is width of slit)

**(a)** Wavelength increases: y_{m} 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)?