Snell's law

Some exam boards require you to understand Snell's law.

To do this first you have to know that:

REFRACTION has an iNdex called N
N = Refractive index

This refraction law relates to our definition of refraction.

REFerence ACTION (Refraction)

$Refraction definition mnemonic - He made reference to wanting more action$

and the reference action is a SNAIL RACE.

$Snell's law refractive index mnemonic of a snail race.$

SNAILS RACE = SNELL'S LAW

And as well as all the above.

SNAILS RACE
has SIN in it

Which reminds you that there is a sin rule too. This sin rule is:

`(sin\ \i\n\ \theta)/(sin\ \out\ \theta)=(n\ \(out))/(n\ \(i\n))`

NOTE: It will be easy to remember that `n\ \(out)` is on the top on the other side when later you find that `n\ \(i\n)` is the value of 1 most of the time.

Summary

Refraction reminds you:

RefractioN and iNdex = N = Refractive index

Refraction reminds you

REFerence ACTION = SNAILS RACE = SNELL'S LAW

SNAILS RACE reminds you

`(sin\ \i\n\ \theta)/(sin\ \out\ \theta)=(n\ \(out))/(n\ \(i\n))`