Question # 1

Fiber optics system can be used for.

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Word processing

Image processing and receiving

Image transmitting

All of the above

Which of the following is used for the failure of a lens to form a sharp and distinct image

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Distortion

Astigmation

Chromatic aberration

Spherical aberration

A Galilean telescope with objective of coal length 30 cm and eyepiece of focal length.8 cm when focused for infinity has length equal to

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7.5 cm

2.2 cm

38 cm

240 cm

In a compound microscope magnification will be large if focal length of eyepiece is

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Large

small

Equal to that of the objective

Larger than that of the objective

A diverging lens may not have

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Negative focal length

Positive focal length

One plane surface

One convex surface

A pencil dipped partially into water appears bent because of.

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Reflection of water surface

Diffraction of water surface

Refraction of water surface

Water is a fluid

A person of height 1.5 m stands 2.0 m in front of a plane mirror How far from the person is her image .

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2.0 m

3.0 m

3.5 m

4.0 m

When of the following colours scatters minimum.

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Blue

Violet

Yellow

Red

Which type of microscope was the first to be developed.

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Optical microscope

Digital microscope

Electron microscope

All were developed at the same time

The deflection image due to oblique centric rays failing on the lens is called.

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Coma

Spherical aberration

Astigmatism

Curvature of image field

The main advantage of step index fiber is.

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The size of the cable

The equality of the cbale

Difference in the wavelengths of signals

All of the above

Spherical aberration can be removed by using

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Concave lens

Convex lens

By limiting the number of rays using a stopper

By using a concave convex lens

A double convex air bubble in water will behave as.

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Plane slab

Concave mirror

Convex lens

Concave lens

Which term is used for human eye deflect near sightedness.

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Myopia

Hypermetropia

Presbyopia

Calaract

Which is the light sensitive tissue in human eye

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Retina

pupil

Iris

Cornea

Telecommunication by Optical fibers is done by

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Single mode step index fibre

Multimode step index fibre

Multimode graded index fibre

All of the above

The diameter of a lens is called.

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Focal length

Principal axis

Optical centre

Aperture

Light entering glass will not suffer change in

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Frequency

wavelength

Speed

Direction

The relation between refractive index an critical angle is.

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sin C =1/n

sin n = 1/C

sin c = 1

n = sin C

In case of a convex lens when object is placed away from 2F, image is formed.

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at F

at 2F

away from 2 F

Between F and 2 F

Parallel rays of light are focused by a thin convex lens.A thin concave lens of the name focal length is then joinjed to the convex lens The focal point will.

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Shift to infinity

shift towards the lens by a small distance

shift away from he lens by a small distance

Remain at its original position

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