When the incidence angle is equal to the angle of refraction

  • #1
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Homework Statement


When the incidence angle is equal to the angle of refraction?

Homework Equations


sina/sinb=n2/n1


The Attempt at a Solution


I think as a=b => sina=sinb => n1=n2. We should have the same environment? But is that refraction?
 

Answers and Replies

  • #2
blue_leaf77
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At the interface of two different media, there is a certain angle of incidence where the incident ray just passes straight through. What is this angle?
 
  • #3
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At the interface of two different media, there is a certain angle of incidence where the incident ray just passes straight through. What is this angle?
when b= pi/2 rad. It is the limit angle for a. sina=n2/n1
 
  • #4
blue_leaf77
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when b= pi/2 rad. It is the limit angle for a. sina=n2/n1
No, that corresponds to critical angle refraction. It very simple, you have Snell's law ##n_1 \sin a = n_2 \sin b##. Try to find a trivial angle ##a=b## which will make the left and right hand side of Snell's law equal irrespective of the refractive indices.
 
  • #5
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No, that corresponds to critical angle refraction. It very simple, you have Snell's law ##n_1 \sin a = n_2 \sin b##. Try to find a trivial angle ##a=b## which will make the left and right hand side of Snell's law equal irrespective of the refractive indices.
a=b=0 rad? 0=0
 
  • #6
blue_leaf77
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Yes.
 
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