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## Homework Statement

look at the figure and prove that sina'=nsinb. We have given a, b, a', b' and n

http://s32.postimg.org/n7rnu0khx/image.png

## Homework Equations

sinb'/sina'=1/n

## The Attempt at a Solution

But in the equation we have b, not b'. I made the figure. How would the correct one be?