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//Chapter-3,Example3_3_8,pg 3-8
//In air
angle_0_air=30 //acceptance angle of an optical fibre
NA=sind(angle_0_air) //Numerical aperture is 'NA^2 = n1^2 - n2^2' also numerical aperture is 'NA=sin(angle)'
n0=1.33 //refractive index of medium
angle_0=asind(NA/n0) //For medium numerical aperture is 'NA=n0*sin(angle_0)'
printf("\nThe acceptance angle in medium is angle_0 = %.2f Degree\n",angle_0)
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