why does angle of incidence does not matter in measuring refractive index

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Solution

$r e f r a c t i v e i n d e x = \frac{s p e e d o f l i g h t i n a i r}{s p e e d o f l i g h t i n v a c u u m .} = \frac{\sin i}{\sin r} w h e r e i i s t h e a n g l e o f i n c i d e n c e w h e r e r i s t h e a n g l e o f r e f r a c t i o n a s s p e e d c h a n g e s, a n g l e c h a n g e s . s o a n g l e o f i n c i d e n c e i s n o t e q u a l t o a n g l e o f r e f r a c t i o n .$
So refractive index depends upon the angle of incidence.

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why does angle of incidence does not matter in measuring refractive index

refractive index = speed of light in airspeed of light in vacuum. = sin i sin rwhere i is the angle of incidencewhere r is the angle of refractionas speed changes, angle changes.so angle of incidence is not equal to angle of refraction. So refractive index depends upon the angle of incidence.