Rule #2:
Diffraction of light as it increases in wavelength causes the diffraction pattern of a wave (which forms the image we observe) to increase in size.
This results in images that we observe appearing larger than they would be without accounting for diffraction. The observed density of light is also decreased since the same amount of energy is distributed over a larger area.
The term “diffraction” is used loosely here as it is typically used to describe the interference of wave patterns caused by an aperture, whereas in TRH, diffraction refers to the change in interference pattern due to increased wavelength.
Olbers Paradox