Question # 1

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 image of the tip of a needle is never sharp because of

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Polarization of light

Interference of light

Diffraction of light

Reflection of light

Electromagnetic waves transport:

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Energy only

Momentum only

Both A and B are correct

None of is correct

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

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Spherical

Cylindrical

Plane

None of these

The locus of all points in a medium having same phase of vibration is called

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Crest

Trough

Wavelength

Wave-front

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

In order to get interference using two light rays

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The sources should be monochromatic and coherent

The sources should have the same frequency

Superposition should be linear

All of these

The ratio of the size of the image to that of object is called:

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Focal length

Aperture

Linear magnification

Principal axis

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

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

Angle between the ray of light and the corresponding wavefront is:

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0°

60°

90°

120°

Which one of the following phenomenon cannot be explained on the bases of Huygen's theory

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Refraction

Reflection

Diffraction

Formation of spectrum

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 that color as compared to that of violet color is:

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Smaller

Longer

Equal

None of these

If the object is placed at 12 cm distance from a convex lens of focal length 6 cm, then we get an image of ____ as that of object:

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Double the size

Same size

Half the size

None of these

The ratio of the diameter of two convex lenses is _____-the ratio of their focal lengths:

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Greater than

Less than

Equal to

None of these

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