Question # 1

the final image obtained by astronomical telescope is.

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Erect

Virtual

Magnified

All of these

The final image seen through ey piece in telescope is.

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Real, enlarge and inverted

Vertual, enlarge and erect

Virtual, enlarge and inverted

In Real, enlarge and erect

Multimode step index fibre is useful for

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Long distances

Short distances

Better quality

Low price

The least distance of distinct vision for the normal eye is.

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15 cm

25 cm

125 cm

25 m

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

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5

6

10

23

Information carrying capacity of optical fibre called.

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Capacity

Band width

Immunity

Ability

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

The final image formed by a simple microscope.

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Virtual and inverted

Real and erected

Virtual and erected

Real and inverted

The magnifying power is also called

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Resolving power

Angular magnification

Strength of eye

None of these

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 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

Reapters are placed in new system at distance of.

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30 km

50 km

80 km

100 km

The Detector in Photo phone is made up of.

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Cadmium

Germanium

Selenium

Silicon

The accepted value for speed of light in vacuum

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2.99 x 10⁸m - sec^-1

2.99 x 10⁶m - sec^-1

2.99 x 10⁸km - sec^-1

2.99 x 10⁸m - h^-1

The optical fiber is covered for protection by a

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Glass Jacket

Plastic Jacket

Copper Jacket

Aluminum Jacket

The types of optical fibres are

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Three

Four

Five

Six

The units of magnifying power of microscope or telescope are.

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Metre

m^-1

dioptre

No unit

The magnifying power of an astronomical telescope is 10. If the focal length of objective is 100 cm, then what is the focal length of eye piece.

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10 cm

100 cm

1000 cm

5 cm

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