Question # 1

The ratio of size of image and size of object is

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Focal length

Magnification

Resolving power

Principle focus

The magnifying power is also called

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Resolving power

Angular magnification

Strength of eye

None of these

Which is not the essential component of a spectrometer.

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Collimator

Telescope

Turntable

Microscope

Reapters are placed in new system at distance of.

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30 km

50 km

80 km

100 km

For normal adjustment what is the length of astronomical telescope if focal lengths of astronomical telescope if focal lengths of objective and eye piece are 100 cm 20 cm respectively.

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10 cm

20 cm

5 cm

120 cm

Information carrying capacity of optical fibre called.

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Capacity

Band width

Immunity

Ability

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

A double convex lens acts as diverging lens when the object is

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At infinity

Inside the focus

A way from focus

A a large distance from lens

The types of optical fibres are

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Three

Four

Five

Six

The light emitted from light emitting diode has wave length.

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1.1 micro meter

1.3 micro meter

1.5 micro meter

1.7 micro meter

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

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Michelson

Hygen's

Galileo

Ability

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 focal length of a concave lens is always

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+ve

-ve

Zero

None of these

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

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Telescope

Optical fibre

Spectrometer

Microscope

The diameter of a lens is called

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Focal length

Aperture

Principle axis

Centre

A convex lens acts as diverging lens if the object is placed at

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F

2F

Between F and 2 F

Within the F

A convex lens can be used as

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Simple microscope

Compound microscope

Telescope

Spectrometer

The units of magnifying power of microscope or telescope are.

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Metre

m^-1

dioptre

No unit

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