# The inverse square law of intensity (i.e., the intensity $$\propto \frac{1}{r^2})$$ is valid for: 1. a point source 2. a line source 3. a plane source 4. a cylindrical source

Subtopic:  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:  Young's Double Slit Experiment |
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When a drop of oil is spread on a water surface, it displays beautiful colours in daylight because of:

 1 dispersion of light 2 reflection of light 3 polarization of light 4 interference of light
Subtopic:  Superposition Principle |
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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:  Young's Double Slit Experiment |
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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:  Young's Double Slit Experiment |
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A thin transparent sheet is placed in front of a Young's double-slit. The fringe-width will:
1. increase
2. decrease
3. remain same
4. become nonuniform

Subtopic:  Young's Double Slit Experiment |
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If Young's double-slit experiment is performed in water,

1. the fringe width will decrease

2. the fringe width will increase

3. the fringe width will remain unchanged

4. there will be no fringe

Subtopic:  Young's Double Slit Experiment |
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A light wave can travel:

 (a) in vacuum (b) in vacuum only (c) in a material medium (d) in a material medium only
Choose the correct option:
 1 (a) and (b) 2 (b) and (c) 3 (a) and (c) 4 (c) and (d)

Subtopic:  Huygens' Principle |
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Which of the following properties of light conclusively support wave theory of light?

(a) Light obeys laws of reflection.

(b) Speed of light in water is smaller than the speed in vacuum.

(c) Light shows interference.

(d) Light shows photoelectric effect.

Choose the correct option:

1. (a) and (b)

2. (b) and (c)

3. (c) and (d)

4. All of these

Subtopic:  Superposition Principle |
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Huygens' principle of secondary wavelets may be used to:
 (a) find the velocity of light in a vacuum. (b) explain the particle behaviour of light. (c) find the new position of a wavefront. (d) explain Snell's law.
Choose the correct option:
1. (a) and (b)
2. (b) and (c)
3. (c) and (d)
4. All of these
Subtopic:  Huygens' Principle |
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