Question # 1

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

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

A layer over the central core of the jacke is called.

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Jacket

Plastic

Cladding

Rubber

The diameter of a lens is called

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Focal length

Aperture

Principle axis

Centre

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 speed of light was measured correctly by

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Galileo

Michelson

Newton

Maxwell

In Michelson's experiment the relation used to find the speed of light is

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16 fc

1/16 fd

16 fd

16/fd

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 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

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 obtained by astronomical telescope is.

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Erect

Virtual

Magnified

All of these

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 units of magnifying power of microscope or telescope are.

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Metre

m^-1

dioptre

No unit

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

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Telescope

Optical fibre

Spectrometer

Microscope

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

The ratio of size of image and size of object is

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Focal length

Magnification

Resolving power

Principle focus

The focal length of convex lens

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Negative

Positive

small

Large

The location of near point changes with

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Age

Size of the eye

Sharpness of the eye

None of these

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