Principle of Buoyancy was given by Archimedes
Principle of Inertia was given by Galileo
Laws of Electromagnetic Induction was given by Faraday
Laws of Motion was given by Newton
Law of Gravitation was given by Newton
Theory of Relativity was given by Einstein
Law of Photoelectricity was given by Einstein
Roentgen discovered X-rays
Laser was discovered by Townes
Wave theory of light was discovered by Huygens