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Problem Using Snell's Law

  • Thread starter hardwork
  • Start date
  • #1
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Homework Statement


The figure (http://i43.tinypic.com/2dt5e2e.jpg") shows a ray of light traveling through a gas (n = 1.00), a solid (n = 1.84), and a liquid (n = 1.61). What is the angle θ made by the ray as it enters the liquid?


Homework Equations


(n1)(sin θ1)=(n2)(sin θ2)


The Attempt at a Solution


(1.00) (sin 90-35) = (1.84) (sin θ)
θ = 26.4 degrees

(1.84) (sin 26.4) = (1.61) (sin θ)
θ = 30.5 degrees
 
Last edited by a moderator:

Answers and Replies

  • #2
rl.bhat
Homework Helper
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(1.00) (sin 90-35) = (1.84) (sin θ)
This is wrong. The angle of incidence is the angle made on the incident ray with the normal.
 
  • #3
20
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Would I just use sin 35 then? I'm confused. :frown:
 
  • #4
rl.bhat
Homework Helper
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yes.
 
  • #5
20
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Thanks! I'll try it again:

(1.00) (sin 35) = (1.84) (sin θ)
θ = 18.2 degrees

(1.84) (sin 18.2) = (1.61) (sin θ)
θ = 20.9 degrees
 
  • #6
rl.bhat
Homework Helper
4,433
5
It is correct.
 

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