- 1(current)
Q. No.Optical fibre is based on:
1. Total internal reflection
2. Less scattering
3. Refraction
4. Less absorption coefficient
Subtopic: Total Internal Reflection |
95%
Level 1: 80%+
AIPMT - 2001
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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 \(\text{sin}^{-1}\left (\frac{2}{3} \right )\) |
Subtopic: Total Internal Reflection |
91%
Level 1: 80%+
AIPMT - 2010
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The critical angle of a prism is \(30^\circ.\) The velocity of light in the medium is:
1. \(1.5\times{10}^{8}~\text{m/s}\)
2. \(3\times{10}^{8}~\text{m/s}\)
3. \(4.5\times{10}^{8}~\text{m/s}\)
4. none of these
1. \(1.5\times{10}^{8}~\text{m/s}\)
2. \(3\times{10}^{8}~\text{m/s}\)
3. \(4.5\times{10}^{8}~\text{m/s}\)
4. none of these
Subtopic: Total Internal Reflection |
90%
Level 1: 80%+
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Two transparent media, \(A\) and \(B,\) are separated by a plane boundary. The speed of light in medium \(A\) is \(2.0 \times 10^8~\mathrm{ms^{-1}},\) while in medium \(B,\) it is \(2.5 \times 10^8~\mathrm{ms^{-1}}.\) What is the critical angle for total internal reflection when light travels from \(A\) to \(B?\)
| 1. | \(\sin^{-1 }(1/2)\) | 2. | \(\sin^{-1 }( 1/5)\) |
| 3. | \(\sin^{-1 }(4/5)\) | 4. | \(\sin^{-1 } (3/4)\) |
Subtopic: Total Internal Reflection |
87%
Level 1: 80%+
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Total internal reflection can take place only if:
| 1. | the light goes from optically rarer medium (smaller refractive index) to optically denser medium. |
| 2. | the light goes from optically denser medium to rarer medium. |
| 3. | the refractive indices of the two media are close to each other. |
| 4. | the refractive indices of the two media are widely different. |
Subtopic: Total Internal Reflection |
84%
Level 1: 80%+
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Critical angle of incidence for a pair of optical media is \(45^\circ .\) The refractive indices of first and second media are in the ratio:
1. \(1:\sqrt{2}\)
2. \(1:2\)
3. \(\sqrt{2}:1\)
4. \(2:1\)
1. \(1:\sqrt{2}\)
2. \(1:2\)
3. \(\sqrt{2}:1\)
4. \(2:1\)
Subtopic: Total Internal Reflection |
81%
Level 1: 80%+
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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: Total Internal Reflection |
80%
Level 1: 80%+
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The speed of light in media 'A' and 'B' are 2.0 × 1010 cm/s and 1.5 × 1010 chm/s respectively. A ray of light enters from the medium B to A at an incident angle '\(\theta\)'. If the ray suffers total internal reflection, then
1. \(\theta=\sin ^{-1}\left(\frac{3}{4}\right) \)
2. \(\theta>\sin ^{-1}\left(\frac{2}{3}\right) \)
3. \(\theta<\sin ^{-1}\left(\frac{3}{4}\right) \)
4. \(\theta>\sin ^{-1}\left(\frac{3}{4}\right)\)
1. \(\theta=\sin ^{-1}\left(\frac{3}{4}\right) \)
2. \(\theta>\sin ^{-1}\left(\frac{2}{3}\right) \)
3. \(\theta<\sin ^{-1}\left(\frac{3}{4}\right) \)
4. \(\theta>\sin ^{-1}\left(\frac{3}{4}\right)\)
Subtopic: Total Internal Reflection |
79%
Level 2: 60%+
JEE
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The critical angle for a diamond, with a refractive index of \(\mu=2,\) is:
1. \(60^\circ\)
2. \(45^\circ\)
3. \(30^\circ\)
4. nearly \(20^\circ\)
1. \(60^\circ\)
2. \(45^\circ\)
3. \(30^\circ\)
4. nearly \(20^\circ\)
Subtopic: Total Internal Reflection |
78%
Level 2: 60%+
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The critical angle for light travelling from medium \(A\) to medium \(B\) is \(\theta. \) If the speed of light in medium \(A\) is \(v,\) what is the speed of light in medium \(B? \)
| 1. | \(v(1-\cos \theta)\) | 2. | \(\dfrac{v}{\sin \theta}\) |
| 3. | \(\dfrac{v}{\cos \theta}\) | 4. | \(v \cos \theta\) |
Subtopic: Total Internal Reflection |
77%
Level 2: 60%+
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