Question # 1

The magnifying power is also called

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Resolving power

Angular magnification

Strength of eye

None of these

The least distance of distinct vision for the normal eye is.

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15 cm

25 cm

125 cm

25 m

The units of magnifying power of microscope or telescope are.

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Metre

m^-1

dioptre

No unit

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

A convex lens can be used as

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Simple microscope

Compound microscope

Telescope

Spectrometer

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

Information carrying capacity of optical fibre called.

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Capacity

Band width

Immunity

Ability

Which is not the essential component of a spectrometer.

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Collimator

Telescope

Turntable

Microscope

Reapters are placed in new system at distance of.

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30 km

50 km

80 km

100 km

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 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

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

Multimode step index fibre is useful for

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Long distances

Short distances

Better quality

Low price

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

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

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 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

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

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