Question

Dan confirms the authenticity of an amethyst stone by a few tests. During one of the tests, he finds the angle of the refracted ray of light coming out of the amethyst into the air as 28°. If the refractive index of amethyst is 1.55, what is the incident angle?
a- 152 degree
b-26 degree
c-47 degree
d-71 degree

Answer 1

do you know what equation to use?

Answer 2

no:/

Answer 3

do you?

Answer 4

yep, so use:

\[\eta _{1}\sin _{1} \Theta=\eta _{2}\sin \theta _{2}\]

Answer 5

n is the refractive index

Answer 6

n for air is 1

Answer 7

so which one would it be?

Answer 8

so (1)sin(28)=(1.55)(sinx)

Answer 9

it said error?

Answer 10

is it 26 degrees?

Answer 11

i keep getting 17.63

Answer 12

are you sure thats the right formula?

Answer 13

yeah I'm pretty sure

Answer 14

i dont understand

Answer 15

sin28 = 0.469

0.469/1.55 = sin x

sinx= 0.3028

asin(0.3028)=x = 17.63

Answer 16

but thats none of the anwers

Answer 17

idk thats what the math is saying :S

Answer 18

omg I'm sorry i read it backwards

Answer 19

it works out now

Answer 20

so what would it be?

Answer 21

plug it into a calculator, i can't so bluntly give you the answer

Answer 22

(1.55)(sin28)=(1)(sinx)

Answer 23

my calculator doesnt work!:/

Answer 24

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

Answer 25

ok thnks

Answer 26

so what was it?

Answer 27

Answer is 47 degrees