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Prism A prism is a portion of transparen...

Prism
A prism is a portion of transparent refracting medium bounded by two plane surfaces inclined to each other at a certain angle, and the angle between the refracting faces is called angle of the prism denoted by A. The deviation produced by the prism is maximum for violet `(delta_v)` and minimum for red `(delta_r)` colour.
The deviation `(delta)` for yellow colour is given by

A

`delta=(delta_v-delta_r)/2`

B

`(delta_v+delta_r)/2`

C

`(delta_r-delta_v)/2`

D

`(delta_r+delta_v)/2`

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