Optics Part66

What is the thickness of a single mode fibre optic?

• 200 micrometer

• 5 micrometer

• 50 micrometer

Divergent light rays give rise to.

• A real image

• A virtual image

• Chromatic aberrations

In fibreoptics the type of cable is chosen by.

• Matching the diameter of the cable to the wavelenght

• Distance required to travel

• The strength of signal needed

A material with a gradually varying refractive index is said to have a.

• Graded index

• Step index

• Single index

Fibre optic cable are capable of transmitting light at.

• 1.99*108 m/s

• 3*108m/s

• 0.99*108m/s

Step index fibre suffer from.

• Dispersion

• Scatter

• Attenuation

Attenuated pulses have their sizes and shape restored by.

• Regenerators

• Impedance matching transformers

• Opto-isolators

Attenuation in fibre optic cable is most often caused by.

• Backscattering and microbends

• Microbends and scattering

• Absoption and scattering

For a concave lens the image is.

• Virtual

• Real

• A chromatic orb

In fibre optic flying control system.

• The sensor and transmitter require electrical power

• The transmitter requires power

• The sensor requires electrical power