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WorksheetsPage 1
Total questions: 10
Worksheet time: 10mins
The core of an optical fibre is primarily used to:
Protect the fibre from moisture
Reduce signal attenuation
Guide light through total internal reflection
Provide mechanical strength
The refractive index of the core is always:
Equal to the refractive index of cladding
Less than the refractive index of cladding
Greater than the refractive index of cladding
Zero
The cladding in an optical fibre is mainly provided to:
Increase the strength of the fibre
Prevent light from escaping the core
Increase the refractive index of the core
Absorb all incident light
The outermost protective layer of an optical fibre is called:
Core
Cladding
Sheath (or Jacket)
Buffer layer
Which material is commonly used for the core of optical fibres?
Plastic
Copper
Silica glass
Rubber
The refractive index of cladding compared to core is:
Higher
Same
Slightly lower
Much higher
The sheath of an optical fibre is used mainly for:
Light transmission
Total internal reflection
Mechanical protection and environmental safety
Increasing numerical aperture
The refractive index of a medium is 1.33. Find the critical angle for the medium–air interface.
42°
49°
57°
63°
The refractive index of a medium is 1.40. What is the critical angle?
35°
42.2°
45.6°
55°
The refractive index of a transparent medium is 1.25. Calculate the critical angle.
38°
45°
53.1°
60°
