This is the one of the best question ever .

This time I shows you the actual reason whether the light bends away or towars the normal .

You should know that , "The light travels with different speed in different medium. "

You were well cleared about the Snell's law of Refraction .

It may be written as ==>

sin i / sin r = 1u2 = vi / v2 ( If you don't understand this line then you should read the chapter clearly.)

Case 1 -

If medium 2 is said to be optical denser than medium 1

v1>v2 . (Clearly the velocity is larger) .

than 1u2 > 1
and sin i / sin r > 1
therefore sin i > sin r
i.e , i > r .

This means that in this case the angle i should be greater than the angle b .

For this, the refracted ray should be be bends towars tge normal ( because if it bends towards the nornal than the angle r automatically become smaller than angle i .) .



For second case

If medium 1 is said to be optical rarer than medium 2

You should do yourself.

If you can't do than I will help you .

Conclusion.

If v1>v2
then , angle i > angle r .
Bends towards the normal


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