- #1

ecastro

- 254

- 8

##\frac{1}{\lambda f} e^{ikr^2f}##,

where ##\lambda## is the wavelength of light and ##f## is the focal length of the lens. I was told that it is called the "lens phase", but I have no luck in finding it using Google.

I suppose this is multiplied when a beam of light travels through a lens.