This is because there are rather few ways in which an image of the incident light can be formed.

Conventional black paint reflects about 2.5% of the incident light.

Glass is transparent because it reflects very little of the incident light.

Only a very small fraction of the incident light is reflected.

There was enough incident light to pick out some detail.

Noise is a measure of the accuracy with which the incident light can be measured.

They reflect 90% to 95% of the incident light when new.

The difference between them is the way they select the wavelengths of incident light.

If the incident light is coherent, these sources all have the same phase.

This could be used for controlling the intensity and direction of incident light.