Question

HI GUYS❤️❤️
What is a spectrum? Why do different coloured rays deviate differently on passing through a glass prism?

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Answer 1

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▶️The band of coloured component of a light beam is called its spectrum. The colour sequence is given by the acronym V I B G Y O R — Violet, Indigo, Blue, Green, Yellow, Orange and Red.

▶️The speed of light of different colours in a medium like glass is different. Varying speeds for different colours lead to different refractive indices for different colours. It has been observed that the refractive index of glass for violet colour is more than that for red colour. All the colours present in white light refract through different angles and hence, emerge out from the prism with different directions and become distinct.

Answer 2

The band of the coloured components of white light. Refractive index speed of light is different for different colours.  By placing a second identical prism in an inverted position with respect to first prism.

The rays of different colours have different speed in a certain medium. Therefore, the refractive index of prism is different for light of different index of prism is different for light of different colours and thus the white light gets dispersed into different colours.