State the dispersion of white light by a glass prism .how did newton ,using two identical glass prism,show that white light is made if seven colours?draw a ray diagram to show the path of a narrow beam of white light,through a combination of two identical prisms arranged together in inverted position with respect to each other,when it is allowed to fall obliquely on one of the faces of the first prism of the combination.
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because every different colour have there different speed like red is more in speed as compare of blue
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