Question # 1

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

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 and unpolarized light

None of them

Angle between ray of light and the corresponding wavefront is

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0⁰

60⁰

90⁰

120⁰

Light waves are

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Mechanical waves

Electromagnetic waves

Any of above

None of above

In case of constructive interference of two waves, the amplitude of the resultant wave is __________ either of the waves

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Greater than

Equal to

Smaller than

None of these

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

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

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

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

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Dispersion

Interference

Reflection

Refraction

Speed of light in vacuum depends upon

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Frequency

Wavelength

Amplitude

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

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

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

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Dispersion

Interference

Reflection

Refraction

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

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ECAT Physics Chapter 10 Optical Instruments Online Test MCQs With Answers

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