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Q. No.The reddish appearance of the sun at sunrise and sunset is due to:
| 1. | the scattering of light. |
| 2. | the polarisation of light. |
| 3. | the colour of the sun. |
| 4. | the colour of the sky. |
Subtopic: Â Total Internal Reflection |
 89%
From NCERT
NEET - 2013
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If the critical angle for total internal reflection from a medium to vacuum is \(45^{\circ}\), the velocity of light in the medium is:
| 1. | \(1.5\times10^{8}~\text{m/s}\) | 2. | \(\frac{3}{\sqrt{2}}\times10^{8}~\text{m/s}\) |
| 3. | \(\sqrt{2}\times10^{8}~\text{m/s}\) | 4. | \(3\times10^{8}~\text{m/s}\) |
Subtopic: Â Total Internal Reflection |
 81%
From NCERT
NEET - 2020
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NEET 2025 - Target Batch
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NEET 2025 - Target Batch
Which set of colors will come out in air for a situation shown in figure?
| 1. | Yellow, Orange and Red |
| 2. | Blue, Green and Yellow |
| 3. | Orange, Red and Violet |
| 4. | All |
Subtopic: Â Total Internal Reflection |
 70%
From NCERT
NEET - 2023
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An empty cylindrical beaker whose height is equal to its diameter is kept on a table. An observer's eye\((E)\) looking towards \(S\) (line of sight: \(ES\)) can see the point \(Q\) on the lower right. The angle of view, \(\theta,\) is the angle the line of sight \(ES,\) makes with the vertical \(RS\)-extended. A transparent liquid is now slowly poured into the beaker. As the liquid level rises in the beaker, the line of sight has to be continually adjusted (by increasing angle \(\theta\)) in order to keep \(Q\) visible. When the liquid fills the beaker to the brim, \(Q\) can no more be seen by adjusting the line of sight \(ES. \) The minimum refractive index of the liquid should be:
1. \(\frac32\)
2. \(2\)
3. \(\sqrt{\frac32} \)
4. \(\sqrt2\)
1. \(\frac32\)
2. \(2\)
3. \(\sqrt{\frac32} \)
4. \(\sqrt2\)
Subtopic: Â Total Internal Reflection |
From NCERT
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