an English physicist, who conducted the Young’s interference experiment
Young’s Interference Experiment
showed that lights (waves) passing through two slits, add together or cancel each other and then interferencefringes appear
Wave theory
Huygens‘ Principle
stated that light was made up of waves, a reading, up-and-down perpendicular to the direction of light travels, therefore formulated, a way of visualizing wave propagation
Huygen suggested that light waves peak from surfaces like the layers of an onion. In vacuums, or other uniform mediums, light waves are spherical in the services advance are spread out asleep, travel at the speed of light
Corpuscular theory
proposed by Newton
States that light is made up of tiny particles called corpuscles. These corpuscles travel in straight lines with high speeds and conserve momentum after reflection or refraction. This theory was able to explain reflection, refraction and dispersion
Electromagnetic theory
Developed by james clerk maxwell
Proposes that light is a form of electromagnetic radiation, a propagating wave
These waves consist of oscillating electric and magnetic fields that are perpendicular to each other and also perpendicular to the direction of propagation of the wave
Quantum theory
Proposed by einstein in 1905
Possessed that light consists of discrete packets of energy called photons (quanta) which exhibit both particle and wave properties
Also known as wave-particle duality
Light
An electromagnetic radiation that a human eye can detect
When it travels it moves in a straight line called ray
Travels at an incredible speed of 299,792km per second
Can come from different sources
Natural sources of light
Come from sun and stars, living things that give off light
Artificial sources of light
Created by humans such as light bulbs
Photoelectric effect
- When uv light shines on a metal surface, electrons are instantly ejected from the metal
