Why does light ray do not bend when it is passed along the normal also optical densities vary in both the mediums?

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$L i g h t r a y s b e n d b e c a u s e o f a c h a n g e o f r e f r a c t i v e i n d e x . a c c o r d i n g t o s n e l l s l a w w e c a n w r i t e \frac{\sin i}{\sin r} = μ n o w a l o n g t h e n o r m a l b o t h i a n d r i s z e r o t h u s t h e r e w i l l b e n o e f f e c t o f r e f r a c t i v e i n d e x a n d t h u s n o b e n d o f l i g h t w i l l o c c u r .$

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Why does light ray do not bend when it is passed along the normal also optical densities vary in both the mediums?

Light rays bend because of a change of refractive index. according to snells lawwe can writesin isinr=μnow along the normal both i and r is zero thus there will be no effect of refractive index and thus no bend of light will occur.