# 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 |
Â 85%
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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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The slits in a Young's double-slit experiment have equal width and the source is placed symmetrically with respect to the slits. The intensity at the central fringe is $$I_0.$$ If one of the slits is closed, the intensity at this point will be:
1. $$I_0$$
2. $$I_0/4$$
3. $$I_0/2$$
4. $$4I_0$$

Subtopic: Â Young's Double Slit Experiment |
Â 62%
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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%
From NCERT
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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 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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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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White light is used to illuminate the double slit in Young's double-slit experiment. Which of the following is/are true?
 I. The central fringe will be white. II. Closest bright fringe to the central fringe will be a violet fringe. III. There will not be any dark fringe.
1. I only
2. I, II
3. I, III
4. I, II, III
Subtopic: Â Young's Double Slit Experiment |
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Find the minimum order of a green fringe ($$\lambda = 500$$ nm) which overlaps a dark fringe of violet ($$\lambda = 400$$ nm) in a Young's double-slit experiment conducted with these two colours.
1. $$4$$
2. $$2$$
3. $$5$$
4. $$2.5$$
Subtopic: Â Young's Double Slit Experiment |
Â 52%
From NCERT