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Image of Convex Mirror

Why are rays ...

Question

Why are rays falling over a mirror or a lens considered to be paraxial?

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Solution

$W h e n t h e r a y s o f l i g h t c o m i n g f r o m a n e x t e n d e d s o u r c e o f l i g h t t h e n t h e s o u r c e o f l i g h t i s c o n s i d e r e d t o b e p o s i t i o n e d a t i n f i n i t y a n d r a y s o f l i g h t c o m i n g f r o m i n f i n i t y a r e t a k e n e i t h e r p a r a l l e l t o p r i n c i p a l a x i s o r t a k e n a s f a l l i n g o n t h e m i r r o r o r a l e n s o b l i q u e l y m a k i n g a n a n g l e w i t h t h e p r i n c i p a l a x i s .$

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