1. | the scattering of light. |
2. | the polarisation of light. |
3. | the colour of the sun. |
4. | the colour of the sky. |
1. | Difference between apparent and real depth of the pond |
2. | Mirage on hot summer days |
3. | Brilliance of the diamond |
4. | Working of optical fibre |
A ray of light travelling in a transparent medium of refractive index \(\mu\) falls on a surface separating the medium from the air at an angle of incidence of \(45^{\circ}\). For which of the following value of \(\mu\), the ray can undergo total internal reflection?
1. \(\mu = 1.33\)
2. \(\mu =1.40\)
3. \(\mu=1.50\)
4. \(\mu = 1.25\)
The speed of light in media \(M_1\) and \(M_2\) is \(1.5\times10^{8}\) m/s and \(2.0\times10^{8}\) m/s respectively. A ray of light enters from medium \(M_1\) and \(M_2\) at an incidence angle \(i.\) If the ray suffers total internal reflection, the value of \(i\) is:
1. | equal to or less than \(\text{sin}^{-1}\left (\frac{3}{5} \right )\) |
2. | equal to or greater than \(\text{sin}^{-1}\left (\frac{3}{4} \right )\) |
3. | less than \(\text{sin}^{-1}\left (\frac{2}{3} \right )\) |
4. | equal to \(\text{sin}^{-1}\left (\frac{2}{3} \right )\) |
A small coin is resting on the bottom of a beaker filled with a liquid. A ray of light from the coin travels up, to the surface of the liquid and moves along its surface (see figure).
How fast is the light traveling in the liquid?
1. | \(1.8 \times 10^8 \mathrm{~m} / \mathrm{s} \) | 2. | \(2.4 \times 10^8 \mathrm{~m} / \mathrm{s} \) |
3. | \(3.0 \times 10^8 \mathrm{~m} / \mathrm{s} \) | 4. | \(1.2 \times 10^8 \mathrm{~m} / \mathrm{s}\) |