Question # 1

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

The appearance of the colour in the soap (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

To see the minor details of the object by microscope, it should have:

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High magnifying power

High resolving power

Am objective of larger focal length

None of these

The least distance of distinct vision is:

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10 cm

25 cm

50 cm

100 cm

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

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0°

60°

90°

120°

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

A grating with high resolving power can distinguish _______ difference in wavelengths :

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Smaller

Larger

Zero

None of these

Monochromatic light means waves of:

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Same frequency

Same colour

Same wavelength

All of them

The terms phase difference and path difference are:

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Same

Different

Equal

None of these

Which one the following gives three regions of electromagnetic spectrum in order of increasing wavelength?

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Gamma rays, micro waves, visible light

Radio waves, ultraviolet waves, X-rays

Ultraviolet rays, infrared rays, micro waves

Visible light, gamma rays, radio waves

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

Stars twinkle due to

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The fact that they do not emit light continuously

The refractive index of earth's atmosphere fluctuates

The Star's atmosphere absorbs its light intermittently

None of these

Which one of the following can act approximately as a source of monochromatic light;

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Neon lamp

Fluorescent tube

Sodium lamp

None of these

Huygen's theory cannot explain

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Diffraction

Interference

Polarization

Photoelectric effect

For the virtual image, option _______ is not correct:

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1/p = 1/f -1/q

1/f = 1/p -1/q

1/p=1/p-1/f

1/p=1/f+1/q

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