Question # 1

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

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

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

The focal length of a concave lens is always

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+ve

-ve

Zero

None of these

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

The diameter of a lens is called

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Focal length

Aperture

Principle axis

Centre

The ratio of size of image and size of object is

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Focal length

Magnification

Resolving power

Principle focus

The speed of light was measured correctly by

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Galileo

Michelson

Newton

Maxwell

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

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

Reapters are placed in new system at distance of.

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30 km

50 km

80 km

100 km

Image formed by a concave lens is

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Real

Virtual

Erect

None of these

Multimode graded index fibre has a core whose diameter range lie from.

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5 to 50 micro meter

50 to 100 micro meter

40 to 1000 micro meter

50 to 10,000 micrometer

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

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

The optical fibre is covered for protection by

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Glass jacket

Plastic jacket

Steel jacket

Diamond jacket

Total confined light is obtained by

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Total internal reflection

Refraction of light

Diffraction

Polarization

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Physics ICS Part 1 Chapter 10 Online Test MCQs With Answers

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