1. The wavelength of the wave: Waves with shorter wavelengths diffract less than waves with longer wavelengths. This is why light waves diffract less than sound waves, and why blue light diffracts less than red light.
2. The size of the opening or obstacle: Diffraction is more pronounced when the size of the opening or obstacle is comparable to the wavelength of the wave. If the opening or obstacle is much larger than the wavelength, the wave will pass through with little diffraction. However, if the opening or obstacle is much smaller than the wavelength, the wave will diffract significantly.
Let me know if you'd like more details about how these factors affect diffraction!
