Question # 1

To sources are said to be coherent if they have:

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Same amplitude

Same wavelength

Definite phase relation with each other

None of them

Light appears to travel in straight line because

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It is not absorbed by the atmosphere

It is refracted by the atmosphere

Its wavelength is very small

Its velocity is very large

Wave length of that color as compared to that of violet color is:

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Smaller

Longer

Equal

None of these

The terms phase difference and path difference are:

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Same

Different

Equal

None of these

The contrast in the fringes in an interference pattern depends upon

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Fringe width

Relative difference intensities of the two sources

Distance between the slits

Wavelength

If the focal length of the convex lens is 5 cm, then to get the real and inverted image of the same size as that of object, the object should be placed at:

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5 cm

10 cm

15 cm

20 cm

If the object is situated at focus of a convex lens, then its image is formed at:

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F

2F

Infinity

None of these

In case of point, source of light shape of wavefront is:

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Spherical

Cylindrical

Plane

None of these

When the object lies between F and 2F, the image formed by is formed at:

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Real

Virtual

Diminished

Erect

In case of destructive interference of two waves, the amplitude of the resultant wave will be ____ either of the waves:

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Greater than

Smaller than

Equal to

None of these

Huygen principle is used to determine:

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Speed of light

Location of wavefront

About polarized or unpolarized light

None of them

The image of the tip of a needle is never sharp because of

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Polarization of light

Interference of light

Diffraction of light

Reflection of light

Electromagnetic waves transport:

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Energy only

Momentum only

Both A and B are correct

None of is correct

The distance from eye to near point is taken as:

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10 cm

15 cm

20 cm

25 cm

Wave length of light, on the average, is given by:

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10^-14_m

10^-10_m

10^-6_m

10^-4_m

A convex lens acts as diverging lens when the object is placed:

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Between F and 2F

At 2F

With focal length

Beyond 2F

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