how many times refraction takes place during dispersion through prism?
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When a ray of light enters the glass prism it gets deviated two times. First when it enters the glass prism and second when it comes out of the prism. This is because the refracting surfaces of the prism are not parallel to each other. Also, when the ray of light passes through the prism it bends towards its base.
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On passing through a glass prism, a ray of light undergoes two refractions. At one rectangular surface of prism, light suffers refraction in going from rarer to denser medium and on other rectangular surface, light undergoes refraction from denser medium to rarer medium.
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