Question # 1

Which type of image is produced by the converging lens of human eye if it views a distant object.

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Real, erect, same size

Real, inverted, diminished

Virtual, erect, diminshed

Virtual, inverted, magnified

Two lenses of focal length 'f' are combined the resultant focal length is

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f

2f

f/2

zero

Fiber optics system can be used for.

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Word processing

Image processing and receiving

Image transmitting

All of the above

Light entering glass will not suffer change in

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Frequency

wavelength

Speed

Direction

The refractive index of benzenes is 1.5 What is the critical angle of benzene.

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0.667 ^o

42 ^o

48^o

90^o

The length of an astronimical telescope for normal vision is.

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fo x fe

fe/fe

fo - fe

fo + fe

When light enters a denser medium

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Its speed slows down

Its speed increases

It is totally reflected

Its speed remains unchanged

The magnifying power of a convex lens of focal length 5 cm is

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3

5

6

20

Which of the following is the cause of failure of a lens to form a sharp and district image of a white object.

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Spherical aberration

Chromatic aberration

Distortion

Astigmatism

In optics, which subfield studies the measurement of electromagnetic radiation including visible light.

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Radiometry

Photometry

Telemetry

Chronometry

In case of a convex lens, image formed at 2 F is

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Virtual, erect and larger than the object

Real, inverted and large than the object

Real, inverted and same size as the object

Real, inverted and smaller than the object

Colour of light is determined by its

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Amplitude

Velocity in air

Wavelength

State of polarization

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

Plossi or symmetrical eye piece consists of

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Two plano convex lenses with same focal length

Two sets of doublets

An achromatic double

A spherical doublet

When a ray of light traveling in a rare medium enters into a denser medium

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It remains undeviated

It is reflected back

It bends towards the normal

It bends away from the normal

To final image produced by a compound microscope is.

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Real and inverted

Real and erect

Virtual and erect

Virtual and inverted

Refraction contributes to the formation of.

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Rainbows only

Mirages only

Echo

Rainbows and mirages

Which of the following be used for redeciding mechanical aberration is optical instruments.

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Plane mirrors

Spherical mirrors

Concave lenses

Plano convex lenses

A fixed point inside the lens through which a ray of light does not change its path is called.

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Pole

Focus

Centre of curvature

Opticla centre

In case of a convex lens when object is placed at 2F image is formed.

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At

2F

away from 2F

Between F at and 2 F

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