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:  Total Internal Reflection |
 89%
From NCERT
NEET - 2013
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Which of the following is not due to total internal reflection?
 
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
Subtopic:  Total Internal Reflection |
 85%
From NCERT
AIPMT - 2011
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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:  Total Internal Reflection |
 63%
From NCERT
AIPMT - 2010
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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 |
 89%
From NCERT
AIPMT - 2010
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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. \(1.8 \times 10^8 ~\text{m/s}\) 2. \(2.4 \times 10^8~\text{m/s}\)
3. \(3.0 \times 10^8~\text{m/s}\) 4. \(1.2 \times 10^8~\text{m/s}\)
Subtopic:  Total Internal Reflection |
 63%
From NCERT
AIPMT - 2007
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