SNELLS LAW: light travels from water into fibre optic cable with an angle of refraction of 21.5° what is the angle of incidence?

refractive index f fibre optic cable: 1.6
refractive index of water

Please can you show how to get to the answer so I understand it better!

1 Answer
Jane
Mar 11, 2018

#26.15^@#

Explanation:

Refractive index of water is #1.33# this is a data we require to solve this problem.

enter image source here From snell's law we can say,

#mu_1 sin theta = mu_2 sin phi# (where, #mu_1# is the refractive index of water,#mu_2# is the refractive index of optic fibre cable,#theta# is the angle of incidence and #phi# is the angle of refraction)

Given, #mu_2=1.6,phi=21.5^@#

So,we can write,using the equation,

#1.33* sin theta =1.6 * sin 21.5#

or, #theta=26.15^@#

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