some+light+vocab

__wave__ – a disturbance that transfers energy from place to place __energy__ – the ability to do work __medium__ – the material a wave moves through __mechanical wave__ – a wave that needs a medium Mechanical waves are produced when a source of energy causes a medium to vibrate. __crest__ – the highest part of a wave __trough__ – the lowest part of a wave wavelength – the distance from crest to crest or trough to trough convex mirror – a mirror whose center section curves toward an object concave mirror – a mirror whose center section curves away from an object refraction – the bending of light as it moves from one material to another focal point – the point at which light rays meet when reflected or refracted laser light – light of a single wavelength with all the waves lined up