State the cause of dispersion of light by a glass prism. How did Newton, using 2 identical glass prisms, show that white light is made of 7 colours. Draw a ray diagram to show the path of narrow beam of white light, through a combination of two identical prisms arranged together in inverted positions 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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When we place a glass prism in the path of a narrow beam of white light a spectrum is obtained. What happens when a second identical prism is placed in an inverted position with respect to the first prism? Draw a labeled ray diagram to illustrate it.

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