Question # 1

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

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

The band of colours is called.

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Spectrum

Prism

Medley

LASER

A double convex an bubble in water will behave as.

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Plane slab

Concave mirror

Convex lens

Concave lens

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

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

A ray of light from air into glass The angle of incidence is 30o if the refractive index of glass in 1.52 The angle of refraction will be.

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16.7 ^o

19.3 ^o

29.6 ^o

39.3 ^o

The ability's of convex lens to produce convergence in a parallel beam is called its.

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Magnification

Focal length

Power

Strength

A diverging lens may not have

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Negative focal length

Positive focal length

One plane surface

One convex surface

What is zoom lens

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It is a lens having fixed focal length

It is a lens having variable focal length

It is a lens used in radii to telescope

All of the above

The magnifying power of a convex lens of focal length 5 cm is

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3

5

6

20

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

Which of the following does not produced an erect image.

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Galilean telescope

Terrestrial telescope

Prism binoculars

Astronomical telescope

The variation of focal length of a lens when we pass from the central portion to periphery is called.

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Coma

Astigmatism

Spherical aberration

Chromatic aberration

The dioptre power of concave lens of 10 cm focal length is.

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0.1 dioptre

1.0 diopter

10 dioptre

-10 dioptre

The primary purpose of using a large aperture objective in a telescope is to produce

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Brighter image

Larger image

Wider field of view

Smaller image

Which eye defect can be rectified by using diverging lens.

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Near sightedness

Far sightedness

presbyopal

Astigmatism

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

Which of the following colours of light passes through glass with minimum speed.

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Green

Yellow

Red

Violet

On which of the following the object size as perceived by eye depends upon.

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Actual size of the object

Aperture of the pupil

Object distance from the eye

Size of the image formed on the retina

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

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