Interference
If light is wave --> should show the phenomenon of interference
making interference with light is more difficult (without laser….):
-we need two point-like sources (dimensions smaller than the wavelength of light,
-in order to get stationary patterns the two sources should have constant phase-difference, and produce waves with the same wavelength!
- in order to distinguish the nodal and antinodal points the two sources should be close (separation: order of the wavelength)
First successful experiment: Thomas Young (1801) --> two slit experiment
wavelength--> determines the distance between nodal lines
distance between nodal lines different for different color light