Interference proves

Explanation:

• In 1678, the Dutch physicist Christiaan Huygens put forward the wave theory of light. He was the founder of the wave theory of light.
• The wave theory of light was first demonstrated by Thomas Young in 1801 through Young's double-slit experiment.
• This experiment shows that the observed pattern of interference occurs due to the superposition of light waves which proves the wave nature of light.
• In this experiment, two narrow slits that are close to each other, are illuminated by a monochromatic light source.
• The two slits are responsible for the production of two different wavefronts which then superimpose on a screen forming the definite interference pattern.
• For two coherent sources s1 and s2, the resultant intensity at some point p is given by

\(I = {I_1} + {I_2} + 2\sqrt {{I_1}{I_2}cos\phi }\)

Hence, interference proves Wave nature.