Q. No.When light is refracted, which of the following does not change?
1. wavelength
2. frequency
3. velocity
4. amplitude
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 |
1. cylindrical
2. spherical
3. plane
4. cubical
Who was the first to propose the concept of secondary wavelets to describe the propagation of waves?
| 1. | Maxwell | 2. | Newton |
| 3. | Huygens | 4. | Fresnel |
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
Which of the following statements accurately describes Huygens' principle of secondary wavelets?
| 1. | It helps to determine the focal length of a thin lens. |
| 2. | It provides the magnifying power of a microscope. |
| 3. | It serves as a geometric method to determine a wavefront. |
| 4. | It is used to calculate the diffraction pattern of light. |
The refractive index of glass is \(1.5\). What is the speed of light in glass?
1. \(2 \times 10^{8}~\text{m/s}\)
2. \(3 \times 10^{8} ~\text{m/s}\)
3. \(1.5 \times 10^{8} ~\text{m/s}\)
4. \(2.2 \times 10^{8}~\text{m/s}\)
(A) \(\nu= 5 \times 10 ^{14}~\text{Hz}\)
(B) \(\nu= 7.5 \times 10^{14}~\text{Hz}\)
(C) \(\lambda= 4000 ~\mathring A\)
(D) \(\lambda= 9000 ~\mathring A\)
Choose the correct option from the given ones:
| 1. | (A), (B) and (C) only |
| 2. | (A) and (C) only |
| 3. | (B) and (D) only |
| 4. | (B), (C) and (D) only |
1. wavelength, speed and frequency decrease.
2. wavelength increases, speed decreases and frequency remains constant.
3. wavelength and speed decrease but the frequency remains constant.
4. wavelength, speed and frequency increases.
1. 2: 3
2. 16: 81
3. 25: 169
4. 25: 1
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