Presentation on theme: "An Introduction to Light. What is light? Sun is our closest star Source of all energy on Earth Energy produced by nuclear reactions in core reach Earth."— Presentation transcript:
What is light? Sun is our closest star Source of all energy on Earth Energy produced by nuclear reactions in core reach Earth in form of light (and heat) Source of all life on Earth
What is light really? Electromagnetic radiation waves Light waves are three dimensional. Light waves vibrate in all planes around a center line. Waves have high points called crests. Waves also have low points called troughs. Distance from one crest to the next crest is called a wavelength. Number of waves passing a given point in one second is called the frequency. wavelength
James Clerk Maxwell English Physicist In 1864, predicted that electricity forms a change travelling through space (electromagnetic waves) Also knew that it would travel at the speed of light Great beard!
Heinrich Hertz German Physicist In 1887, he proved what Maxwell had predicted 23 years earlier Guess who got credit for the work? Good beard…at best