- 1(current)
Q. No.| 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. |
When light is refracted, which of the following does not change?
1. wavelength
2. frequency
3. velocity
4. amplitude
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. \({\cos^{-1}\left({1}/{\sqrt{3}}\right )}\)
The wavefronts of light coming from a distant source of unknown shape are nearly:
1. plane
2. elliptical
3. cylindrical
4. spherical
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
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 |
| (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 |
Light waves travel in vacuum along the X-axis. Which of the following may represent the wavefronts?
1. \(x=c\)
2. \(y=c\)
3. \(z=c\)
4. \(x+y+z=c\)
- 1(current)
Q. No.
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