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~ A.F ~:
Depends on the medium

if water's n= 1.5, air's n= 1/1.5

Ghost Of Highbury:

--- Quote from: ~VIN1094~ on May 05, 2010, 07:47:31 pm ---
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

--- End quote ---

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.

Malak:

--- Quote from: A@di on May 05, 2010, 08:20:12 pm ---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.

--- End quote ---

But wat if the R.I is given n we r supposed to find an Angle...Is there a way to know using which form of the equation is correct..?

haris94:
if thats the case, then just keep in mind that

* if ray is going from denser to rarer, then angle of refraction will be greater than angle of incidence
* if ray is going from a rarer to a denser medium, then the angle of incidence is greater than the angle of refraction

Malak:

--- Quote from: The Mysterious Dude on May 04, 2010, 01:12:25 pm ---Sorry, internet bad, very slow cant upload much.

--- End quote ---

Is this diagram correct for that question :S

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