Question # 1

Monochromatic light passing through a thick prism is.

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Polarize

Disperesed

Diffracted

Deviated

When the angel of incidence becomes larger than the critical angle no refraction occurs This is known is.

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Diffraction

Refraction

Total internal reflection

Diffuse reflection

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

Image formed by a concave lens is.

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Real

Magnified

Virtual

Real and magnified

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

What is the cause of mirage in desert areas.

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Refractive index of atmosphere increases with height

Refractive index of atmosphere decreases with height

Refractive index of atmosphere remains constant

Scattering

In a magnifying glass, the objective is placed at a distance

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Less than the focal

Between the focal length and twice the focal length

Greater than twice the focal length

At the focus of the lens

Colour of light is determined by its

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Amplitude

Velocity in air

Wavelength

State of polarization

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

What is the focal length of a normal eye lens.

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1 mm

2 cm

25 cm

1 m

Two convex lenses of equal focal length 'f' are placed in contact, the resultant focal length is

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Zero

1

2f

f/2

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

A lens whose thickness is small as compared to focal length is a

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Concave lens

Double concave lens

Convex lens

Plano concave lens

Which one of the following telescopes has the least length when set for parallel rays.

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Astronomical telescope

Galileo's telescope

Terrestrial telescope

Reflecting telescope

Which is defined as the ration of image height of the object height.

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Linear magnification

Angular magnification

Magnifying power

Resolution

When of the following colours scatters minimum.

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Blue

Violet

Yellow

Red

The index of refraction depends on

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the focal length

The speed of light

The image distance

The object distance

The characteristic of an image formed by a plane mirror is.

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It is of the same size as the object

It is laterally inverted

It is upright

All of the above

To obtain is parallel beam from the headlight of a car it must be fitted with.

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A convex mirror

A concave mirror

A convex lens

A concave lens

For a prism of particular and given wavelength the resolving power varies as

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First power of lens of its base

Square of inverse length of its base

Increases of length of its base

Cube of the length of its base

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