Diffraction

Question 1

What is diffraction

Answer 1

The spreading out or bending of wave after passing through a small gap or slit.

Question 2

Huygen’s wave theory of light

Answer 2

It states that light travels in form of wave and that all the points of the wavefront behaves like secondary source emitting wavelets that are in phase with one another.

Question 3

Types of diffraction

Answer 3

Frensel diffraction: when the screen and the source are both at finite distance
Fraunhofer diffraction: when the screen and the source are effectively at infinity. In this case lens are used.