Question # 1

Using a graded Index fibre, the time difference is reduced to about.

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1 ns per km

33 ns per 100 km

33 ns per km

1 ns per 100 km

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

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 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

Reapters are placed in new system at distance of.

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30 km

50 km

80 km

100 km

The diameter of a lens is called

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Focal length

Aperture

Principle axis

Centre

The final image formed by a simple microscope.

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Virtual and inverted

Real and erected

Virtual and erected

Real and inverted

The types of optical fibres are

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Three

Four

Five

Six

The focal length of a concave lens is always

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+ve

-ve

Zero

None of these

A convex lens can be used as

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Simple microscope

Compound microscope

Telescope

Spectrometer

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

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 device used to study the spectra from different sources of light is

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Telescope

Optical fibre

Spectrometer

Microscope

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

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15 cm

25 cm

125 cm

25 m

Multimode step index fibre is useful for

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Long distances

Short distances

Better quality

Low price

The magnifying power of a convex lens of focal lendth 10 cm is

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7

9.6

11

3.5

The units of magnifying power of microscope or telescope are.

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Metre

m^-1

dioptre

No unit

If a convex lens is used as a magnifying glass, whcih lens will give higher magnification that has.

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Short size

Long focal length

Large size

Short focal length

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