Question # 1

A double convex lens acts as diverging lens when the object is

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At infinity

Inside the focus

A way from focus

A a large distance from lens

The speed of light was measured correctly by

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Galileo

Michelson

Newton

Maxwell

The focal length of a concave lens is always

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+ve

-ve

Zero

None of these

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

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

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

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 units of magnifying power of microscope or telescope are.

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Metre

m^-1

dioptre

No unit

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 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

A convex lens can be used as

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Simple microscope

Compound microscope

Telescope

Spectrometer

The optical fiber is covered for protection by a

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Glass Jacket

Plastic Jacket

Copper Jacket

Aluminum Jacket

A convex lens acts as diverging lens if the object is placed at

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F

2F

Between F and 2 F

Within the F

The location of near point changes with

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Age

Size of the eye

Sharpness of the eye

None of these

Which is not the essential component of a spectrometer.

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Collimator

Telescope

Turntable

Microscope

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

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Regenerator

Generator

Repeater

Diode

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Physics ICS Part 1 Chapter 10 Online Test MCQs With Answers

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