define polarising angle and critical angle. establish relation between them

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Dear Student,

polarising angle: the angle at which unpolarized light or other electromagnetic radiation must be incident upon a nonmetallic surface for the reflected radiation to acquire maximum plane polarization .
Critical angle: the angle of incidence beyond which rays of light passing through a denser medium to the surface of a less dense medium are no longer refracted but totally reflected.
$t o f i n d t h e r e l a t i o n b e t w e e n t h e m \tan i = μ; i t m e a n s t h a t i f r e f r a c t i v e i n d e x i s μ t h e n a n g l e m u s t b e s u c h t h a t \tan i = μ f o r p o l a r i z a t i o n o f r e f l e c t e d l i g h t . n o w r e f l e c t i o n t a k e s p l a c e b e t w e e n t w o t r a n s p a r e n t m e d i a w h e n i t i s i n c i d e n t a t c r i t i c a l a n g l e . a t c r i t i c a l a n g l e T I R t a k e p l a c e . \sin θ_{c} = 1 / μ t h e r f o r e \sin θ_{c} = 1 / \tan i R e g a r d s$

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