Question # 1

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

Which of the following quantities is not changed during refraction of light.

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Its direction

Its speed

Its frequency

Its wavelength

Which part of hole located in the centre of the eye that allows light to enter the retina.

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Iris

Pupil

Cornea

Fovea

Image formed by a camera is

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Real, inverted, and diminished

Virtual, upright and diminished

Virtual, upright and magnified

Real, inverted and magnified

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

Which mirror be used for obtaining a parallel beam of light from a small lamp.

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Plane mirror

Convex mirror

Concave mirror

All of these

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 length of Galilean telescope is given by

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fo + fe

fo- fe

1/fo - 1/fe

1/fo = 1/fe

The band of colours is called.

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Spectrum

Prism

Medley

LASER

The image formed on the film of a simple camera is.

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Real inverted and diminished

Virtual, upright, and diminished

Virtual, upright and magnified

Real, inverted and magnified

What is the refractive power of cornea in humans.

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13 dioptres

23 diaoptres

33 dioptres

43 dioptres

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 object of a telescope is very large this is to have an image which is.

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More magnified

Of better resolution

More bright

More clear

A Fly is found to be sitting on a telescope when it is focused towards the moon What effect is expected on the photograph of the moon.

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Intensity remains unchanged

No effect

The complete field of view is blocked

Coloured image will be seen

When a ray of light is incident perpendicularly to the boundary of two media.

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It pass through without bending

It is speed is faster int he optically denser medium

It derivates from its original path

It is totally reflected back

The index of refraction depends on

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the focal length

The speed of light

The image distance

The object distance

In compound microscope, image formed by the eyepiece is

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Real

Invented

Erect

Diminished

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 critical angle for a beam of light passing from water into air is 48.8 o This mean that all light rays with an angle of incidence greater than this angle will be.

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Absorbed

Totally reflected

Partially reflected and partially transmitted

Totally transmitted

linear magnification is the ratio between the

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Distances of object and image from mirror

Distances of object and image from the focal point

Distance of image and object from the mirror

Distance of image from object and the distance of object from mirror

For a prism of particular and given wavelength the resolving power varies as

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First power of lens of its base

Square of inverse length of its base

Increases of length of its base

Cube of the length of its base

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