Question # 1

Image formed by a concave lens is.

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Real

Magnified

Virtual

Real and magnified

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 an obliquely falling ray of light enters from one medium ot another it changes its path this phenomenon is called.

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Reflection

Refraction

Diffusion

Diffraction

What is the refractive power of cornea in humans.

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13 dioptres

23 diaoptres

33 dioptres

43 dioptres

The maximum distance between an object and its real image in case of convex lens is

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f

2f

2.5 f

4 f

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

The normal adjustment the magnifying power of an astronomical telescope is.

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fe/fo

fo/fe

fo+ fe

fo -fe

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

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

The band of colours is called.

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Spectrum

Prism

Medley

LASER

The point midway between the lens surface on its participial axis

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Optical centre

Principal focus

Focal plane

Focal length

Which type of image is formed by a concave lens on a screen.

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Inverted and real

Inverted and virtual

Upright and real

Upright and virtual

The erecting lens of a telescope produces

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A shorter instrument

wider field of view

A larger image

A sharp image

The resolving power of an instrument increases as the wavelength of light used decreases, the magnifying power will

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Remain the same

Increases

Decreases

Have no relation between the two

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

Dioptre is the term used for describing the

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Intensity of light

Density of air

Power of light

Refractive index

The index of refraction depends on

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the focal length

The speed of light

The image distance

The object distance

A simple astronomical telescope consists of two

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Concave lenses

Convex mirrors

Convex lenses

Plano convex lenses

Which of the following are defects is lenses.

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Chromatic aberration

Spherical aberration

Astigmation

All of the above

Monochromatic light passing through a thick prism is.

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Polarize

Disperesed

Diffracted

Deviated

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

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