Question # 1

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

Stars twinkle due to

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The fact that they do not emit light continuously

The refractive index of earth's atmosphere fluctuates

The Star's atmosphere absorbs its light intermittently

None of these

In YDS experiment, fringe spacing means the distance between two consecutive ____fringes.

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Bright

Dark

Any of A and B

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

Which one of the following can act approximately as a source of monochromatic light;

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Neon lamp

Fluorescent tube

Sodium lamp

None of these

Which one of the following phenomenon cannot be explained on the bases of Huygen's theory

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Refraction

Reflection

Diffraction

Formation of spectrum

How is the image formed by a convex lens affected if the upper half of the lens is covered with a paper:

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The upper half of the image is cut off

The brightness of the image is reduced

The brightness of the image is increased

No effect at all

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

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Smaller

Longer

Equal

None of these

To observe interference of light, the condition, which must be met with is that the sources must be:

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Monochromatic

Phase coherent

Both of above

None of above

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

The magnifier forms a virtual image of the object at:

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Least distance of distinct vision

Much farther than the least distance

Both A and B are correct

None of these

The locus of all points in a medium having same phase of vibration is called

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Crest

Trough

Wavelength

Wave-front

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

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Spherical

Cylindrical

Plane

None of these

A prism splits a beam of white light into seven component colors. This is so because

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Phase of different colors is different

Amplitude of different colors is different

Wavelength of different colors is different

Velocity of different colors is different

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

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