hey in the ms they say refractive index (n) = sin i / sin r ... OR sin r / sin r
so aren't they two different things??
n can some1 explain me the question too..its june 09 paper 3
One quick tip about when to use sin r / sin i and the reverse.
Mostly, go for sin i/sin r, however, if the answer is less than 1, reverse it. Meaning, use sin r/sin i.
This is because , refractive indices are never < 1. So, whener u get the index < 1, u know that the formula u've used is incorrect.