Question # 1

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

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

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Dispersion

Interference

Reflection

Refraction

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 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

Speed of light in vacuum depends upon

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Frequency

Wavelength

Amplitude

None of these

Angle between ray of light and the corresponding wavefront is

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0⁰

60⁰

90⁰

120⁰

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

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

Light has

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Wave nature

Dual nature

Particle nature

None of them

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

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

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Dispersion

Interference

Reflection

Refraction

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

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Spherical

Cylindrical

Plane

None of above

The wave nature of light was proposed by

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Newton

Thomas Young

Huygen

None of these

Light waves are

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Transverse waves

Longitudinal waves

Compressional

None of them wave

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ECAT Physics Chapter 10 Optical Instruments Online Test MCQs With Answers

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