Question # 1

Which of the following is used for reducing spherical aberrations in optical instruments.

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Plano convex lens

Concave lens

Spherical mirrors

Piane mirrors

For total internal reflection the light rays enter

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From rarer to denser medium

From, denser to rarer medium

Medium of same refractive index

At an angle 90 ^o

A leser beam may be used to measure very large distance because it is.

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Unidirectional

Cohernet

Monochromatic

Not absorbed

The blooming of the image due to dispersion in lenses is called.

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spherical aberration

Chromatic aberration

Astigmation

Curvature of image field

A simple astronomical telescope consists of two

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Concave lenses

Convex mirrors

Convex lenses

Plano convex lenses

The function of collimator in spectrometer is to

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Disperse the light

Reflect the light

Make the light parallel

Diffract the light

If a single convex lens is placed closed to the eye then it can be used as

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Telescope

Simple microscope

Compound microscope

Opera glass

The relation between angle of incidence and angle of refraction is known as.

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Snell's law

Refractive index

Index of refraction

All of the above

In case of a convex lens, when object is placed at F

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the image is formed beyond 2 F

the image is formed between F and 2 F

No image is formed

the image is formed behind the object

A negative magnification always means the the image is.

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Erect

Real

Virtual

Inverted

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 of the following does not produced an erect image.

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Galilean telescope

Terrestrial telescope

Prism binoculars

Astronomical telescope

The bending of light when it enters a medium

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Reflection

Refraction

Diffraction

Total internal reflection

Which term is used for human eye deflect near sightedness.

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Myopia

Hypermetropia

Presbyopia

Calaract

The image of distant object as seen through as astronomical telescope is.

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Real and inverted

Virtual and inverted

Real and erect

Virtual and erect

Two convex lens focal length 'f' use din combination become telescope. When the distance between them is.

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1

4f

2f

f/2

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

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2

3

4

Infinite

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

Which law states that the angle of incidence equals the angle of refraction.

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Law of reflection

Law of refraction

Snell's law

Hygens's principle

An object of placed at the centre of curvature of a concave mirror The image produced by the mirror is located.

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Out beyond the centre of curvature

At the centre of curvature

Between the centre of curvature and the focal point

At the focal point

What is true is real images formed by a converging lens.

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they are inverted

They are on the same side of the lens as the object

They can never be shown on a screen

They cannot be seen

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