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Refraction of Light through a Prism

Consider a triangular glass prism. It has two triangular bases and three rectangular lateral surfaces. These surfaces are inclined to each other. The angle between its two lateral faces is called angle of prism.


Here PE is the incident ray, EF is the refracted ray and FS is the emergent ray. You may note that a ray of light is entering from air to glass at first surface AB. The light ray on refraction has bent towards the normal. At the second surface AC, the light ray has entered from glass to air. Hence it has bent away form the normal. The peculiar shape of the prism makes the emergent ray bend at an angle to the direction of incident ray. This angle is called the angle of deviation. In the case Ð D is the angle of deviation.       

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