state the cause of dispersion of white light by a glass prism . how did newton, using two identical glass prisms , show that white light is made of 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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the cause of dispersion of white light is the change in speed of light with wavelength.when white light enters the first surface of a prism ,light of different speed in glass ,get deviated through different angles toward the base of prism
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