Diffraction Flashcards
1
Q
What is diffraction
A
The spreading out or bending of wave after passing through a small gap or slit.
2
Q
Huygen’s wave theory of light
A
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.
3
Q
Types of diffraction
A
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.
