Question

What is Airy’s disc?Answer the given question in brief.

Answer 1

n my understanding, this is relevant to photography because if you are shooting light of a certain wavelength (or primarily so, and such as: a blue scene), your aperture size can affect the sharpness of your image. It should also be helpful in determining the maximum useful sensor resolution, for a given sensor size. (that is: the smallest pixel size)

If you use formulas, which I expect you will - please also include a simple explanation (i.e.: "making the aperture smaller makes the first minimum of the airy pattern closer or further")

Please provide an easily understandable, but also relatively-complete understanding of the airy disc. What affect do these have: the aperture diameter, wavelength, distance from aperture to light source and sensor, focal length, etc.