## snells law

so my given is 1.52 20degrees = 1.10 sin r

im trying to find sin r which comes out to 18.9 degrees but im not sure how find that, can somebody help me out please?

so you do 1.10/1.52

do you divide that into sin 20?
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 I don't quite understand your notation.... Is that first part : 1.52 * 20 deg?
 snells law is n1 sin i = n2 sin r n1= 1.52 sin i = 20 deg n2 = 1.10 sin r = ? sin r actually equals 28.2 deg but i don't understand the process

## snells law

Isn't this just simple algebra? What do you get when you solve for the unknown variable?
 I got 27.6 as my answer...
 ......... $$\sin{x}$$ does not give you an answer in degrees. $$n_1 \sin{\theta_1} = n_2 \sin{\theta_2} \Longrightarrow \theta_1 = \sin^{-1}\left( \frac{n_2}{n_1} \sin{\theta_2}\right)$$
 Isn't the question what is sin r? Not what is the angle...
 Well, in that case he's in for a surprise if he wants it to "come out to $$18.9^\circ$$"
 but how do you do it 1.10/1.52 =.723 sin 20=.723 then im stuck....
 Look for the $$\sin^{-1}$$ button on your calculator. Apply it as in the equation I put above.
 first calculate sin(20) then multiply that by 1.52 then divide by 1.10 then take the arcsin/inverse sin of that number make sure its in degrees and yorue done. 28.2