Question # 1

Huygen's principle states that

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Light travels in straight line

Light has dual nature

Either of these

None of these

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

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Spherical

Cylindrical

Plane

None of above

The appearance of colours in the soap (or oil) film results from

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Dispersion

Interference

Reflection

Refraction

The appearance of colours in the soap (or oil) film results from

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Dispersion

Interference

Reflection

Refraction

The speed of the secondary wavelets as mentioned in Huygen's principle is ________ the speed of propagation of the wave itself

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Equal to

Greater than

Smaller than

None of these

The locus of all the points in the same phase of vibration is called

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Wave pocket

Wavefront

Wave number

None of these

The terms phase difference and path difference are

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Same

Different

Equal

none of these

Two 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

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

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Neon lamp

Fluorescent tube

Sodium lamp

None of these

The property of light which does not change with the nature of the medium is

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Frequency

Amplitude

Wavelength

None of these

Speed of light in vacuum depends upon

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Frequency

Wavelength

Amplitude

None of these

Frequency of red colour as compared to that of violet colour is

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Equal

Smaller

Greater

None of these

A line which represents the direction of travel of a wave is known as

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Spherical wavefront

Locus

Ray

Either B or C

Light waves are

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Mechanical waves

Electromagnetic waves

Any of above

None of above

When the source of light is at very large distance, the shape of wavefront is

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Spherical

Cylindrical

Plane

None of these

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