13. What is meant by diffraction? Compare and contrast diffraction and interference. What is meant by a diffraction pattern? Describe the diffraction pattern for light passing through a thin slit.

What about through a double slit? Describe in detail, both qualitatively(with appropriate diagrams) and quantitatively (list relevant equations) the following:double-slit interference, single-slit diffraction, double-slit diffraction. Do the same for the diffraction pattern for light passing through a circular opening. What implications does this have for the resolution of an optical instrument? What is Rayleigh's criterion?