Question # 1

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

An object is -14 cm in front of a convex mirror The image 5.8 cm behind the mirror. What is the focal length of the mirror.

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-4.1 cm

-8.2 cm

- 9.9 cm

-20 cm

In a compound microscope objective lens acts as a projector and eye place as a

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Compensator

Erecting lens

Simple microscope lens

Turntable

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

a spectrometer is used to study

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Spectrum

Waveform

Interference

Diffraction

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

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Linear magnification

Angular magnification

Magnifying power

Resolution

Which parameter is an indication of colour of a star.

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Weight

Distance

Sixe

Temperature

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

Loss of power is optical fibre result into

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Poor receipt ion of signals

Delay in time for reception of signals

accurate information at the receivers

All of the above

Dioptre is the term used for describing the

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Intensity of light

Density of air

Power of light

Refractive index

Which instrument measures the magnification of a telescope.

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lactometer

dynamometer

Wattmeter

Ammeter

A double convex air bubble in water will behave as.

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Plane slab

Concave mirror

Convex lens

Concave lens

Which of the following phenomenon is caused by the different speeds of light in differed optical media.

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Reflection

Refraction

Diffraction

Total internal reflection

To get large magnifying power of an astronomical telescope. we should have focal length of eye lens.

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Small

Large

Of any value

Infinity

The phenomenon of total internal reflection occurs in

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Optical fibre

Rainbow

Mirage

All of these

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

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f

2f

f/2

zero

The maximum number of rays required by a lens to form an image are

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2

3

4

Infinite

On which property of lens, longitudinal chromatic aberration depend upon

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Resolving power

Dispersive power

Magnifying power

Radius of curvature

The power of a convex lens is 5 D at what distance the object should be placed from the lens so that its real and 2 times larger image is formed.

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25 cm

30 cm

35 cm

40 cm

Which parameter determines the brightness of a light source sensed by an eye.

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Light energy entering the eye

Wavelength of light

Total radiant flux entering the eye

Total luminous flux entering the eye

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

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