Question # 1

Image formed by a concave lens is

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Real

Virtual

Erect

None of these

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

The Detector in Photo phone is made up of.

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Cadmium

Germanium

Selenium

Silicon

The focal length of a concave lens is always

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+ve

-ve

Zero

None of these

The focal length of convex lens

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Negative

Positive

small

Large

If an object lies at focus point F in front of a converd lens, its image is formed at.

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2F

F

3F

Infinity

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

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 types of optical fibres are

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Three

Four

Five

Six

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

__ will travel faster than other through an optical fibre.

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Ultraviolet light

Visible light

Infrared light

White light

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 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

In an object is placed in between focus point and Opticla center of a convex lens, the image formed by lens is.

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Real inverted

Virtual diminshed

Virtual inverted

Virtual erected

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

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Regenerator

Generator

Repeater

Diode

The speed of light was measured correctly by

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Galileo

Michelson

Newton

Maxwell

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