define prism. draw the diagram
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Answer:
This angle is known as Angle of deviation. The angle of deviation is the angle between the direction of the refracted ray and the direction of the incident ray when a ray of light passes from one medium to another.In optics, a prism is a transparent optical element with flat, polished surfaces that refract light.
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A prism is a wedge-shaped transparent body which causes incident light to be separated by color upon exiting. ... Since "white" light is really a superposition of different wavelengths, the prism therefore has the effect of angularly separating the incident light by color .