Question # 1

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 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 location of near point changes with

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Age

Size of the eye

Sharpness of the eye

None of these

The optical fibre is covered for protection by

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Glass jacket

Plastic jacket

Steel jacket

Diamond jacket

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

Critical angle is that incident angle in denser medium for which angle of refraction is.

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0 ^o

45 ^o

90 ^o

120 ^o

Reapters are placed in new system at distance of.

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30 km

50 km

80 km

100 km

The magnifying power is also called

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Resolving power

Angular magnification

Strength of eye

None of these

More details of an object can be seen with a microscope by using

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Green light

Red light

Yellow light

Blue light

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

__ will travel faster than other through an optical fibre.

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Ultraviolet light

Visible light

Infrared light

White light

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 Detector in Photo phone is made up of.

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Cadmium

Germanium

Selenium

Silicon

Image formed by a concave lens is

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Real

Virtual

Erect

None of these

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

The speed of light was measured correctly by

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Galileo

Michelson

Newton

Maxwell

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