State the cause of dispersion of white light passing through a glass prism, How did Newton show that white light of sun contains seven colours using two identical glass prisms. Draw a ray diagram to show the path of light when two identical glass prisms are arranged together in inverted position with respect to each other and a narrow beam of white light is allowed to fall obliquely on one of the focus of the first prism.
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the cause of dispersion is the change in speed of light with wavelength .when white light enters the first surface of a Prism ,light of different colours due to their different speeds in glasses gets deviated towards the base of the prism through different angles that is the Dispersion of white light into its constituent colours takes place at the first surface of prism.
Newton's experiment -
Newton allowed white light from the sun to enter a dark room with through a small aperture in a window and placed a glass prism in the path of white light .the light coming out of the prism was received on a white screen .on the screen a coloured patch like a rainbow was found which was termed as spectrum .starting from the side of the base of the prism the colours of the spectrum on the screen in the following order violet Indigo blue green yellow orange and red the order of colouring
Newton's experiment -
Newton allowed white light from the sun to enter a dark room with through a small aperture in a window and placed a glass prism in the path of white light .the light coming out of the prism was received on a white screen .on the screen a coloured patch like a rainbow was found which was termed as spectrum .starting from the side of the base of the prism the colours of the spectrum on the screen in the following order violet Indigo blue green yellow orange and red the order of colouring
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