# For light diverging from a point source: (a) the wavefront is spherical. (b) the intensity decreases in proportion to the distance squared. (c) the wavefront is parabolic. (d) the intensity at the wavefront does not depend on the distance. Choose the correct option: 1. (a), (b) 2. (a), (c) 3. (b), (c) 4. (c), (d)

Subtopic: Â Huygens' Principle |
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Two slits are made one millimetre apart and the screen is placed one meter away. What is the fringe separation when blue-green light of wavelength $$500$$ nm is used?
1. $$0.5$$ mm
2. $$0.3$$ mm
3. $$0.05$$ mm
4. $$0.03$$ mm

Subtopic: Â Young's Double Slit Experiment |
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Two slits are made one millimetre apart and the screen is placed one metre away. What should the width of each slit be to obtain $$10$$ maxima of the double-slit pattern within the central maximum of the single-slit pattern?
1. $$2~\text{mm}$$
2. $$0.2~\text{mm}$$
3. $$0.02~\text{mm}$$
4. $$20~\text{mm}$$

Subtopic: Â Interference vs Diffraction |
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Light is:

 1 a wave phenomenon 2 a particle phenomenon 3 both particle and wave phenomenon 4 none of the above
Subtopic: Â Diffraction |
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Which of the following properties show that light is a transverse wave?
1. reflection
2. interference
3. diffraction
4. polarization

Subtopic: Â Polarization of Light |
Â 69%
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When light is refracted into a medium then,
 1 its wavelength and frequency both increase. 2 its wavelength increases but frequency remains unchanged. 3 its wavelength decreases but frequency remains unchanged. 4 its wavelength and frequency both decrease.

Subtopic: Â Huygens' Principle |
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Which of the following sources gives the best monochromatic light?
1. a candle
2. a bulb
3. a mercury tube
4. a laser

Subtopic: Â Young's Double Slit Experiment |
Â 78%
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The wavefronts of light coming from a distant source of unknown shape are nearly:
1. plane
2. elliptical
3. cylindrical
4. spherical

Subtopic: Â Huygens' Principle |
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Two sources are called coherent if they produce waves:

 1 of equal wavelength 2 of equal velocity 3 having same shape of wavefront 4 having a constant phase difference

Subtopic: Â Young's Double Slit Experiment |
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Two coherent sources of different intensities send waves which interfere. The ratio of maximum intensity to the minimum intensity is $$25.$$ The intensities of the sources are in the ratio:
1. $$25:1$$
2. $$5:1$$
3. $$9:4$$
4. $$625:1$$

Subtopic: Â Young's Double Slit Experiment |
Â 80%
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