Question # 1

In an interference pattern of Young's Double Slit (YDS) experiment

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Bright fringes are wider than dark fringes

Dark fringes are wider than bright fringes

Both dark and bright fringes are of equal width

Central fringes are wider than the outer fringes

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 followings can act approximately as a source of monochromatic light

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Neon lamp

Fluorescent tube

Sodium lamp

None of these

Light has

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Wave nature

Dual nature

Particle nature

None of them

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

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

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Equal

Smaller

Greater

None of these

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

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Frequency

Amplitude

Wavelength

None of these

In YDS experiment, fringe spacing means the distance between two consecutive _________ fringes

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Bright

Dark

Any of A or B

None of these

Monochromatic light means wave of

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Same frequency

Same colour

Same Wavelength

All of them

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

Electromagnetic waves transport

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Energy only

Momentum only

Both A and B

None is correct

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

Light waves are

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Mechanical waves

Electromagnetic waves

Any of above

None of above

Laws of reflection and refraction can also be explained by

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Particle nature of light

Quantum nature of light

Wave nature of light

Complex nature of light

The terms phase difference and path difference are

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Same

Different

Equal

none of these

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ECAT Physics Chapter 10 Optical Instruments Online Test MCQs With Answers

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