Question

WILL MEDAL FOR CORRECT ANSWER:
A light wave travels through water (n = 1.33) at an angle of 35. What angle does it have when it passes from the water into air (n = 1.00)?
A. 25.5
B. 25.5
C. 0.763
D. 49.7

Answer 1

Use the equation.

Answer 2

When a ray enters a medium with a greater refraction index, it refracts and gets closer to the normal line, N

Answer 3

okay.. and that means n= 1.00 like it says in the question..

Answer 4

okay i get that.

Answer 5

the tricky part, is the angle 35 degrees with respect to the normal or with respect to the water surface

Answer 6

okay im confused with n again. is it going to be 1.00 or 1.33? or does it goes from 1.33 into the 35 degree angle to 1.00?

Answer 7

water has a refractive index of 1.333, and air has a refractive index of about 1

Answer 8

ohh okay.

Answer 9

okay. im following a bit.

Answer 10

we can use the equation
$$
\Large { n_1 \sin\theta_1 = n_2 \sin \theta_2
}
$$

Answer 11

you can use the equation
$$
\Large { n_1 \sin\theta_1 = n_2 \sin \theta_2
\\ \therefore \\
1.33 \sin (35^o) = 1 \sin \theta_2
}
$$

Answer 12

1.33(sin theta 1) = 1.00 (sin theta 2) right?

Answer 13

make sure you are in degree mode if you are using a calculator

Answer 14

okay i got 0.762.

Answer 15

good

Answer 16

so that's the answer? 0.763?

Answer 17

$$
\Large { n_1 \sin\theta_1 = n_2 \sin \theta_2
\\ \therefore \\
1.33 \sin (35^o) = 1 \sin \theta_2
\\ \iff \\
\\0.76285 = \sin \theta_2
}

$$

Answer 18

we have to use inverse sine of 0.762

Answer 19

I got 49.716.

Answer 20

$$
\Large { n_1 \sin\theta_1 = n_2 \sin \theta_2
\\ \therefore \\
1.33 \sin (35^o) = 1 \sin \theta_2
\\ \iff \\
\\0.76285 = \sin \theta_2
\\ \sin^{-1}(0.76285) = \theta_2
}

$$

Answer 21

yes thats correct

Answer 22

yay!! thank you!! :)

Answer 23

you dont mind that i deleted some of the other posts, which were not relevant

Answer 24

Not at all. :)

Answer 25

Thanks for your help. :)

Answer 26

is it correct?

Answer 27

Yes it was :)

Answer 28

great, so they used the angle with the normal in both cases.
but sometimes the angle will be with respect to the water or surface. so watch out for that

Answer 29

okay :)

Answer 30

but angle of incidence is always with respect to the normal :)