Question # 1

The line passing symmetrically though the optical center of the lens is.

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Focal plane

Principal focus

Principal axis

Focal length

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

Which is the thick circular structure in teh eye containing an aperture with variable diameter It controls the amount of light reaching the retina.

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Retina

Iris

Pupil

Cornea

In compound microscope, image formed by the eyepiece is

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Real

Invented

Erect

Diminished

A concave mirror is used to form an image of the sun on a white screen IF the lower half of the mirror were covered with an opaque card the effect on the image on the screen would be.

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Negligible

To make the image less bright than before

To make the upper half of the image disappear

To make the lower half of the image disappear.

To reduce spherical aberration in optical instruments which of the following should be used.

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Plano convex lenses

Concave lenses

Spherical mirrors

Plane mirrors

The ablate of rays of different colours to converge a single point sifter refraction though a convex lens is called.

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Come

Distortion

Spherical aberration

Chromatic aberration

Which instrument measures the magnification of a telescope.

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lactometer

dynamometer

Wattmeter

Ammeter

A bi convex lens of a material of refractive index 1.5 has the radius of curvature of each side equal to 50 cm the power of the lens will be.

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0.5 dipotre

1.0 dioptre

1.5 diopter

2.0dioptre

Fiber optics system can be used for.

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Word processing

Image processing and receiving

Image transmitting

All of the above

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

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

The distance between the optical centre and principal focus is

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Focal plane

Focal length

Optical centre

Principal axis

Dioptre is the term used for describing the

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Intensity of light

Density of air

Power of light

Refractive index

In a compound microscope magnification will be large if focal length of eyepiece is

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Large

small

Equal to that of the objective

Larger than that of the objective

If the image is virtual then its distance from the lens is taken.

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Positive

Negative

Double

Half

Why does a glass plate inside a colorless liquid become invisible

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The colours of both are same

The densities of both are same

Their refractive indices are same

Their refractive indices are different

Parallel rays of light are focused by a thin convex lens.A thin concave lens of the name focal length is then joinjed to the convex lens The focal point will.

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Shift to infinity

shift towards the lens by a small distance

shift away from he lens by a small distance

Remain at its original position

Total internal reflection occurs when the angle of incidence is.

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Greater than the angle of refraction

Equal to the critical angle

Greater than the critical angle

Greater than 45^o

A convex lens of focal length 6 cm to be used to from a virtual image three times the size of the object Where must the lens be placed.

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1 cm

2 cm

3 cm

4 cm

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

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2

3

4

Infinite

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