Lasers

LASER stands for Light Amplification by Stimulated Emission of Radiation.Lasers are sources of monochromatic coherent light with rays almost perfectly parallel.A convex lens can focus light onto a very fine spot.The beam power is then concentrated in a small area and can illuminate the double slits directly.The Source of Laser LightElectrons inside atoms move to lower energy levels.As each electron moves to a lower level it emits a photon.Each photon causes more photons to be emitted (stimulated emission) as it passes through a light-emitting substance.The stimulated photons are in phase with the incident photon so the light source is coherent.