Question

3. Light coming from a fish makes an incidence angle of 30° to normal under the water. The index of refraction of water is 1.33. A fisherman is looking at the fish through air. At what angle with the normal (θr) will the fish appear to the fisherman? Use Snell’s law: nisinθi = nrsinθr.

Answer 1

@funscience

Answer 2

HINT: The index of refraction for air is 1.00 (memorize this).

Now solving this problem with Snell's Law should be easy!

Answer 3

yes, you can do it. Just plug in the given information.

Answer 4

recall that r is for refracted angle and i is for the incident angle.

Answer 5

i know ni is 1.33 and is nr 1? and i think 0i is 30 degrees

Answer 6

Can you post your calculations?

Answer 7

well i just figured that from the numbers given in the equation

Answer 8

Look at this:

\[1.33 \sin30 =1\sin \theta \]\[\sin \theta=1.33\sin30\]\[\theta = \sin^{-1} (1.33\sin30)\]\[\theta = \space ?\]

Answer 9

you should always draw a diagram. it really helps

Answer 10

I can plug that into a scientific calculator to get the answer

Answer 11

I dont really know how to draw pictures for these types of problems

Answer 12

i got 0.01215

Answer 13

look at this diagram

Answer 14

make sure you're in degrees and not radians

Answer 15

do you know of a good website for a scietific calculator

Answer 16

you can download a scientific calculator on your phone. look at this file

Answer 17

or http://web2.0calc.com/

Answer 18

oh okay those make it a little more clear

Answer 19

Im trying to get the answer now

Answer 20

I cant do it for some reason

Answer 21

you'll need to just do the calculations. @matt101 already gave you the derivation

Answer 22

so in the calculator i push sin the (1.33 sin) (30)?

Answer 23

no, you'll need to get the arcsin of 1.33sin30. so one the webcalc you'll have to press 2nd then asin

Answer 24

When i put it all in i got 30

Answer 25

i got 22 degrees

Answer 26

get yourself a calculator

Answer 27

that's all :D

Answer 28

I will lol thanks again :)