what is the relation between incident ray and emergent ray in a prism?

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Solution

There is relation between incident angle and emergent angle not between the rays and it is given below,
$L e t a r a y i n c i d e n t a t a n a n g l e i_{1} a n d i t e m e r g e s a t a n g l e i_{2} . T h e n t h e r e l a t i o n b e t w e e n t h e s e t w o a n g l e s i s δ = (i_{1} + i_{2}) - A w h e r e δ i s t h e a n g l e o f d e v i a t i o n A i s a n g l e o f p r i s m .$

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