If a light travels in a certain medium and it gets reflected off an optically denser medium with high refractive index, then it is regarded as _______

• External Reflection

• Internal Reflection

• Refraction

• Both a and b

In an optical fiber, the concept of Numerical aperture is applicable in describing the ability of __________

• Light Collection

• Light Scattering

• Light Dispersion

• Light Polarization

The wavelength region used in second window

• 800 to 900 nm

• 1100 to 1350nm

• 1500 to 1650nm

• 1200 nm to 1400 nm

The significance of fourth generation optical communication system is

• Optical amplifier

• Optical source

• Optical coupler

• splicers

The ratio of the refractive index difference of the

core and cladding to the refractive index of core of an optical fiber

• Fractional Index Change

• V-Number

• Numerical Aperture

• Acceptance Angle

The schematic represents

• Graded index optical fibre

• Step index optical fibre

• Single mode optical fibre

• Dual optical fibre

The core of the optical fibre is

• opaque and conducting material.

• opaque and dielectric material.

• transparent and conducting material.

• transparent and dielectric material.

The minimum angle of incidence ( $\theta$ 1) at which the ray strikes the interface of the two medium and causes an angle of refraction ( $\theta$ 2) equal to 90 $\degree$  is known as

• Refractive Index

• Numerical Aperture

• Acceptance Angle

• Critical Angle

Determine the NA of fiber with the acceptance angle 17.36 $\degree$ 

• 0.298

• 1.45

• 6

• 0.22

What are the types of fiber

• Multi Mode Graded Index Fiber

• Multi Mode Step Index Fiber

• Single State Index Fiber

• Single Mode Fiber