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Calculate critical angle of incidence between two material with different refractive indices n1 = 1.4 and n2 = 1.36. Also calculate numerical aperture and acceptance cone angle.
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a) Critical angle (ϕc)=Sin1(n2n1)ϕc=Sin1(1.36/1.4)ϕc=76.27o

b) Numerical Aperture(NA) =(n12n22)1/2NA=(1.421.362)1/2NA=0.33

C) Acceptance angle (ϕa)=Sin1NAϕa=Sin10.33ϕa=19.32O

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