Question # 1

If the object is at 5 cm from the lens of simple microscope than its magnifying power will be.

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5

10

15

25

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

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Telescope

Optical fibre

Spectrometer

Microscope

If focal length of objective and eye piece is 0.5 m and 10 cm respectively then magnifying power of telescope will be.

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0.5

5

10

20

The light signal in Opticla fiber must be regenerated by advice called.

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Regenerator

Generator

Repeater

Diode

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

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Resolving power

Magnification

Scattering

Reflection

Information carrying capacity of optical fibre called.

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Capacity

Band width

Immunity

Ability

Multimode step index fibre is useful for

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Long distances

Short distances

Better quality

Low price

A layer over the central core of the jacke is called.

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Jacket

Plastic

Cladding

Rubber

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 location of near point changes with

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Age

Size of the eye

Sharpness of the eye

None of these

If an object is placed with in the focal length of a convex lens, its image is formed.

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Real

Inverted

Virtual

Smaller than object

The magnifying power is also called

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Resolving power

Angular magnification

Strength of eye

None of these

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

Which is not the essential component of a spectrometer.

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Collimator

Telescope

Turntable

Microscope

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

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5

6

10

23

The focal length of convex lens

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Negative

Positive

small

Large

The diameter of a lens is called

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Focal length

Aperture

Principle axis

Centre

__ will travel faster than other through an optical fibre.

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Ultraviolet light

Visible light

Infrared light

White light

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