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WorksheetsOFC FIRST MODULE
Total questions: 20
Worksheet time: 11mins
When light strikes a surface, it does 4 main things. It can..
Reflect
refract
transmit
absorb
all of he above
select the examples of refraction
Which of the following statement about optical fibre is incorrect?
Light is totally internally reflected down the fibre
It is used in medical (endoscope)
It is used in fibre optic communication.
Angle of incidence of light in optical fibre must less than critical angle.
Chose the TWO conditions are NOT correct for total internal reflection to take place
The incident angle should be less than the critical angle
The incident angle should be greater than the critical angle
Light should travel from a denser to a lighter medium
Light should travel from a lighter to a denser medium
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 core of a fiber optic cable is made of
Air
Glass
Diamond
Quartz
Optical fibers suffer radiation losses at bends or curves on their paths. State true or false
True
False
Optical fibers for communication use are mostly fabricated from
Plastic
Silica or multicomponent glass
Ceramics
Copper
If a particular optical power is coupled from an incoherent LED into a low-NA fiber, the device must exhibit very high radiance . State whether the given statement is true or false
True
False
A permanent joint formed between two different optical fibers in the field is known as a
Fiber splice
Fiber connector
Fiber attenuator
Fiber dispersion
One of the given statements is true for intermodal dispersion. Choose the right one.
Low in single mode and considerable in multimode fiber
Low in both single mode and multimode fiber
High in both single mode and multimode fiber
High in single mode and low in multimode fiber
Identify the meridional rays
•The optical fiber with a core of (a) refractive index n1 , and a cladding of a slightly lower refractive index n2 is known as step index fiber.
select the properties of graded index fiber
The refractive index of the core is made to vary gradually
The path of light is helical in manner
The path of light is zig -zag in manner
attenuation is less
attenuation is more
select the correct statements about plastic optical fibers
can be used in high temperature applications
higher information transmission capacity
simple and less expensive
greater flexibility and less light weight
choose the correct block diagram of optical fiber communication system
The numerical aperture for a step index fiber is sine angle of the ____________
Efficient angle
Aperture
Acceptance angle
Attenuation
What is a specific path the light takes in an optical fiber corresponding to a certain angle and number of reflection
Mode
Grade
Numerical Aperture
Dispersion
The wavelength of light has no role in
Diffraction
Interference
Polarization
Reflection
Cable attenuation is usually expressed in terms of
Loss per foot
dB/km
intensity per mile
voltage drop per inch
