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 |
Â 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: Â Total Internal Reflection |
Â 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: Â Total Internal Reflection |
Â 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: Â Total Internal Reflection |
Â 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: Â Total Internal Reflection |
Â 63%
From NCERT
AIPMT - 2007
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