Light strikes a 5.0-cm thick sheet of glass at an angle of incidence in air of 5

Question

Light strikes a 5.0-cm thick sheet of glass at an angle of incidence in air of 50. The sheet has parallel faces and the glass has an index of refraction 1.50.

(a) What is the angle of refraction in the glass?

Note that from Snell's law,      
      
n1sin(t1) = n2sin(t2)      
      
where      
      
n1 = index of refraction of first medium =    1 --> WHERE DOES THE 1 COME FROM????????- THANK YOU
t1 = angle of incidence =    50   degrees
n2 = index of refraction of second medium =    1.5  
t2 = angle of refraction
      

      
t2 =    30.71022077   

Explanation / Answer

index of refraction of air is 1.

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