If the critical angle for total internal reflection from a medium to vacuum is $45°$, the velocity of light in the medium is:
1. $$1.5\times10^{8}$$ m/s
2. $$\frac{3}{\sqrt{2}}\times10^{8}$$ m/s
3. $$\sqrt{2}\times10^{8}$$ m/s
4. $$3\times10^{8}$$ m/s

Subtopic:  Total Internal Reflection |
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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$°$

2. 180$°$

3. 0$°$

4. equal to the angle of incidence

Subtopic:  Total Internal Reflection |
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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 |
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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 °. 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 |
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The speed of light in media M1 and M2 is 1.5 × 108 m/s and 2.0 × 108 m/s respectively. A ray of light enters from medium M1 to M2 at an incidence angle i. If the ray suffers total internal reflection, the value of i is -

1. Equal to or less than sin–1 $\left(\frac{3}{5}\right)$

2. Equal to or greater than sin–1 $\left(\frac{3}{4}\right)$

3. less than sin–1$\left(\frac{2}{3}\right)$

4. Equal to sin–1 $\left(\frac{2}{3}\right)$

Subtopic:  Total Internal Reflection |
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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 upto the surface of the liquid and moves along its surface (see figure).

How fast is the light traveling in the liquid?

1.

2.

3.

4.

Subtopic:  Total Internal Reflection |
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For the given incident ray as shown in the figure, in the condition of total internal reflection of this ray, the minimum refractive index of the prism will be:

1. $\frac{\sqrt{3}+1}{2}$

2. $\frac{\sqrt{2}+1}{2}$

3. $\sqrt{\frac{3}{2}}$

4. $\sqrt{\frac{7}{6}}$

Subtopic:  Total Internal Reflection |
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A disc is placed on the surface of a pond which has a refractive index of $\frac{5}{3}$. A source of light is placed 4 m below the surface of liquid. Find The minimum radius of a disc so that light does not come out from it.
1.  ∞
2.  3 m
3.  6 m
4.  4 m

Subtopic:  Total Internal Reflection |
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Optical fibre is based on:
1. total internal reflection
2. less scattering
3. refraction
4. less absorption coefficient

Subtopic:  Total Internal Reflection |
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Rainbow is formed due to:

1. Scattering & refraction

2. Total internal reflection & dispersion

3. Reflection only

4. Diffraction and dispersion

Subtopic:  Total Internal Reflection |
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To view explanation, please take trial in the course below.
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