1. A fiber optic system having refractive index of glass 1.5 and for clad it is 1.51. Calculate

i) Numerical aperture

ii) Maximum acceptance angle.

2. Consider a fiber in air with m₁ = 1.53, n₂ = 1.50. Calculate numerical aperture and critical

angle.

3. For a fiber with glass core m = 1.5 and fused quartz cladding n₂ = 1.46, determine the

critical angle (oc), acceptance angle on and numerical aperture for source to fiber medium

no = 1.

4. A multimode step index fiber with a core refractive index of 1.4917 and that of cladding

1.4894 micrometre and wavelength of 1.3 micrometre.

Calculate -

i) Numerical aperture

ii) Critical angle of core cladding interface

iii) Number of modes.

5. The numerical aperture for a fiber is 0.352 and core diameter is 50 µm with light wavelength

of 0.8 μm. Calculate number of modes.