Question # 1

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

Wave length of light, on the average, is given by:

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10^-14_m

10^-10_m

10^-6_m

10^-4_m

Light waves are:

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Transverse wave

Longitudinal wave

Compressional wave

None of them

Monochromatic light means waves of:

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Same frequency

Same colour

Same wavelength

All of them

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

When a source of light isat very large distance,the shape of wavefront is:

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Spherical

Cylindrical

Plane

None of these

The image of an object 5 mm length is only 1 cm high. The magnification produced by lens is:

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1

0.2

2

0.1

The size of the image is maximum when its distance from the magnifying glass is:

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0.10 m

0.15 m

0.20 m

0.25 m

The superposition of the two waves of same frequency and amplitude travelling in the same direction gives to an effect called

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Diffraction

Interference

Polarization

Dispersion

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

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

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

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

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Wave packet

Wave front

Wave number

None of them

With age, least distance of distinct vision:

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Increases

Decreases

Is not affected

None is correct

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