Question # 1

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 optical fibre is covered for protection by

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Glass jacket

Plastic jacket

Steel jacket

Diamond jacket

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

Image formed by a concave lens is

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Real

Virtual

Erect

None of these

The ratio of size of image and size of object is

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Focal length

Magnification

Resolving power

Principle focus

The focal length of a concave lens is always

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+ve

-ve

Zero

None of these

The magnifying power is also called

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Resolving power

Angular magnification

Strength of eye

None of these

Information carrying capacity of optical fibre called.

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Capacity

Band width

Immunity

Ability

The speed of light was measured correctly by

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Galileo

Michelson

Newton

Maxwell

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

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Resolving power

Magnification

Scattering

Reflection

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

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

Critical angle is that angle of incident ofr which angle of refraction is.

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90 ^o

45 ^o

42 ^o

24 ^o

The focal length of convex lens

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Negative

Positive

small

Large

The Detector in Photo phone is made up of.

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Cadmium

Germanium

Selenium

Silicon

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

Multimode step index fiber is useful for.

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Long distance

Sort distance

Very long distance

Infinite distance

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