Q. No.A passenger in an aeroplane shall
| 1. | never see a rainbow. |
| 2. | may see a primary and a secondary rainbow as concentric circles. |
| 3. | may see a primary and a secondary rainbow as concentric arcs. |
| 4. | shall never see a secondary rainbow. |
Subtopic: Â Total Internal Reflection |
From NCERT
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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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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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Light travels in two media \(M_1\) and \(M_2\) with speeds \(1.5 \times 10^8 ~\text{ms}^{-1}\) and \(2.0 \times 10^8~ \text{ms}^{-1}\) respectively. The critical angle between them is:
1. \( \tan ^{-1}\left(\dfrac{3}{\sqrt{7}}\right ) \)
2. \( \tan ^{-1}\left(\dfrac{2}{3}\right) \)
3. \(\cos ^{-1}\left(\dfrac{3}{4}\right) \)
4. \(\sin ^{-1}\left(\dfrac{2}{3}\right)\)
1. \( \tan ^{-1}\left(\dfrac{3}{\sqrt{7}}\right ) \)
2. \( \tan ^{-1}\left(\dfrac{2}{3}\right) \)
3. \(\cos ^{-1}\left(\dfrac{3}{4}\right) \)
4. \(\sin ^{-1}\left(\dfrac{2}{3}\right)\)
Subtopic: Â Total Internal Reflection |
 63%
From NCERT
JEE
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In total internal reflection when the angle of incidence is equal to the critical angle for the pair of media in contact, what will be the angle of refraction?
| 1. | \(90^{\circ}\) |
| 2. | \(180^{\circ}\) |
| 3. | \(0^{\circ}\) |
| 4. | equal to the angle of incidence |
Subtopic: Â Total Internal Reflection |
 76%
From NCERT
NEET - 2019
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A ray of light incident normally on one of the faces of a right-angled prism is found to be totally internally reflected as shown in the figure. What is the minimum value of the refractive index of the prism?
1. \(\sqrt{2}\)
2. \(\sqrt{\dfrac{3}{2}}\)
3. \(\dfrac{4}{3}\)
4. \(1.5\)
1. \(\sqrt{2}\)
2. \(\sqrt{\dfrac{3}{2}}\)
3. \(\dfrac{4}{3}\)
4. \(1.5\)
Subtopic: Â Total Internal Reflection |
 80%
From NCERT
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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. \(\mu = 1.25\)
Subtopic: Â Total Internal Reflection |
 64%
From NCERT
AIPMT - 2010
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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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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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A rectangular block of glass \(ABCD\) has a refractive index \(1.6\). A pin is placed midway on the face \(AB\) (see figure). When observed from the face \(AD\), the pin shall
Choose the correct option:
| (a) | appear to be near \(A\). |
| (b) | appear to be near \(D\). |
| (c) | appear to be at the centre of \(AD\). |
| (d) | not be seen at all. |
| 1. | (a), (c) | 2. | (b), (d) |
| 3. | (c), (d) | 4. | (a), (d) |
Subtopic: Â Total Internal Reflection |
From NCERT
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