Physics Course/Light/Light and Glass

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introduction light is a form of energy which cause the sensation of vision when it reaches our eyes.when a light fall on a surface or object, it bounces back to our eyes. this enable us to see objects around us. when light by any meansdoes not reach our eyes from an object, it cannot be seen by us. RAY AND BEAM OF LIGHT A very narrow stream of light energyshowing direction of path taken by light is called a ray.