Question # 1

Multimode graded index fibre has a core whose diameter range lie from.

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5 to 50 micro meter

50 to 100 micro meter

40 to 1000 micro meter

50 to 10,000 micrometer

The ability of reveal the minor details of an object under examination is called.

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Resolving power

Magnification

Scattering

Reflection

The focal length of convex lens

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Negative

Positive

small

Large

The types of optical fibres are

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Three

Four

Five

Six

The magnifying power is also called

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Resolving power

Angular magnification

Strength of eye

None of these

__ will travel faster than other through an optical fibre.

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Ultraviolet light

Visible light

Infrared light

White light

The first person who attempted to measure the speed of light was.

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Michelson

Hygen's

Galileo

Ability

Using a graded Index fibre, the time difference is reduced to about.

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1 ns per km

33 ns per 100 km

33 ns per km

1 ns per 100 km

The minimum distance from eye at which an object appears to be distinct is

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Near point

Focal length

Image distance from lens

Object distance from lens

Critical angle is that incident angle in denser medium for which angle of refraction is.

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0 ^o

45 ^o

90 ^o

120 ^o

the final image obtained by astronomical telescope is.

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Erect

Virtual

Magnified

All of these

Total confined light is obtained by

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Total internal reflection

Refraction of light

Diffraction

Polarization

The magnification of a convex lens of focal length 5 cm is equal to.

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5

6

10

23

The device used to study the spectra from different sources of light is

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Telescope

Optical fibre

Spectrometer

Microscope

Which is not the essential component of a spectrometer.

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Collimator

Telescope

Turntable

Microscope

In Michelson's experiment the relation used to find the speed of light is

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16 fc

1/16 fd

16 fd

16/fd

The Detector in Photo phone is made up of.

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Cadmium

Germanium

Selenium

Silicon

The ratio of size of image and size of object is

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Focal length

Magnification

Resolving power

Principle focus

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