- 1(current)
Q. No.Light travels a distance \(x\) in time \(t_1\) in air and \(10x\) in time \(t_2\) in another denser medium. What is the critical angle for this medium?
| 1. | \(\sin ^{-1}\left(\frac{10 t_1}{t_2}\right) \) | 2. | \(\sin ^{-1}\left(\frac{ t_2}{t_1}\right) \) |
| 3. | \(\sin ^{-1}\left(\frac{10 t_2}{t_1}\right) \) | 4. | \(\sin ^{-1}\left(\frac{ t_1}{10t_2}\right) \) |
Subtopic: Â Total Internal Reflection |
 66%
From NCERT
NEET - 2023
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Which set of colours would be observed in the air under the conditions depicted in the figure?
| 1. | yellow, orange, and red |
| 2. | blue, green, and yellow |
| 3. | orange, red, and violet |
| 4. | all of the above |
Subtopic: Â Total Internal Reflection |
 75%
From NCERT
NEET - 2023
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Two transparent media \({A}\) and \({B}\) are separated by a plane boundary. The speeds of light in those media are \(1.5\times 10^{8} \) m/s and \(2.0\times 10^{8} \) m/s, respectively. The critical angle for a ray of light for these two media is:
| 1. | \(\text{tan}^{-1}(0.750)\) | 2. | \(\text{sin}^{-1}(0.500)\) |
| 3. | \(\text{sin}^{-1}(0.750)\) | 4. | \(\text{tan}^{-1}(0.500)\) |
Subtopic: Â Total Internal Reflection |
 80%
From NCERT
NEET - 2022
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During a cloudy day, a primary and a secondary rainbow may be created. Which of the following statement is correct?
| 1. | primary rainbow is due to double internal reflection and is formed above the secondary one. |
| 2. | primary rainbow is due to double internal reflection and is formed below the secondary one. |
| 3. | secondary rainbow is due to double internal reflection and is formed above the primary one. |
| 4. | secondary rainbow is due to a single internal reflection and is formed above the primary one. |
Subtopic: Â Total Internal Reflection |
 68%
From NCERT
NEET - 2022
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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. | \(\dfrac{3}{\sqrt{2}}\times10^{8}~\text{m/s}\) |
| 3. | \(\sqrt{2}\times10^{8}~\text{m/s}\) | 4. | \(3\times10^{8}~\text{m/s}\) |
Subtopic: Â Total Internal Reflection |
 83%
From NCERT
NEET - 2020
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Pick the wrong statement in the context with a rainbow.
| 1. | Rainbow is a combined effect of dispersion, refraction, and reflection of sunlight. |
| 2. | When the light rays undergo two internal reflections in a water drop, a secondary rainbow is formed. |
| 3. | The order of colors is reversed in the secondary rainbow. |
| 4. | An observer can see a rainbow when his front is towards the sun. |
Subtopic: Â Total Internal Reflection |
 75%
From NCERT
NEET - 2019
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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 |
 90%
From NCERT
NEET - 2013
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In the figure, a ray of light is perpendicular to face \(\mathrm {AB}\) of a glass prism \((\mu=3/2)\). If prism is immersed in water \((\mu=4/3),\) what will be the maximum value of \(\theta\) so that ray suffers total internal reflection at face \(\mathrm{AC}\)?
(Take \(\text{sin}^{-1}(8/9)=63^\circ\))
1. \(15^\circ\)
2. \(27^\circ\)
3. \(37^\circ\)
4. \(45^\circ\)
(Take \(\text{sin}^{-1}(8/9)=63^\circ\))
1. \(15^\circ\)
2. \(27^\circ\)
3. \(37^\circ\)
4. \(45^\circ\)
Subtopic: Â Total Internal Reflection |
 76%
From NCERT
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