# PROBLEM 4 # 

 Standard formula used 
 theta_c = asin(mu2 / mu1) * (180 / pi). 
 NA = sqrt(mu1^2 - mu2^2). 
 theta_0 = asin(NA) * (180 / pi). 

 Numerical aperture = 0.390512,
 Acceptance angle is 22.986391 degree.
 No. of reflections per meter is 5206