Question

Define why prism gives out 7 colours when kept in light supply.

Answer 1

Prism only acts as a medium for the dispersion of light made of the seven colors. Refraction occurs when the light falls on the prism. The wavelength and frequency of these deviated colors is different, they deviate differently at different angles due to the velocity difference of the prism.
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Answer 2

it is due to the assembly of prism because it has 2 triangular bases and 3 rectangular lateral surfaces