Q. No.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 from the options given below:
1.
(a) and (b) only
2.
(b) and (c) only
3.
(c) and (d) only
4.
all of the above
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 from the options given below:
| 1. | (a) and (b) only |
| 2. | (b) and (c) only |
| 3. | (a) and (c) only |
| 4. | (c) and (d) only |
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. \(4I_0\)
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 |
The wavefronts of a light wave travelling in vacuum are given by \(x+y+z=c\). The angle made by the direction of propagation of light with the X-axis is:
1. \(0^{\circ}\)
2. \(45^{\circ}\)
3. \(90^{\circ}\)
4. \({\cos^{-1}\left({1}/{\sqrt{3}}\right )}\)
| 1. | that the central maximum is wider. |
| 2. | more number of fringes. |
| 3. | less number of fringes. |
| 4. | no diffraction pattern. |
| 1. | \(250~\text{nm}\) | 2. | \(500~\text{nm}\) |
| 3. | \(1000~\text{nm}\) | 4. | \(2000~\text{nm}\) |
1. \(12\)
2. \(6\)
3. \(8\)
4. \(9\)
1. \(60^\circ\)
2. \(75^\circ\)
3. \(30^\circ\)
4. \(45^\circ\)
A monochromatic light of frequency \(500~\text{THz}\) is incident on the slits of Young's double slit experiment. If the distance between the slits is \(0.2~\text{mm}\) and the screen is placed at a distance \(1~\text{m}\) from the slits, the width of \(10\) fringes will be:
| 1. | \(1.5~\text{mm}\) | 2. | \(15~\text{mm}\) |
| 3. | \(30~\text{mm}\) | 4. | \(3~\text{mm}\) |
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