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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Two transparent media A and B are separated by a plane boundary. The speed of light in those media are 1.5 × 108 m/s and 2.0 × 108 m/s, respectively. The critical angle for a ray of light for these two media is:
1. tan-1 (0.750)
2. sin-1 (0.500)
3. sin-1 (0.750)
4. tan-1 (0.500)
Subtopic:  Total Internal Reflection |
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During a cloudy day, a primary and a secondary rainbow may be created. Which of the following statement is correct?
1. primary rainbow is due to double internal reflection and is formed above the secondary one.
2. primary rainbow is due to double internal reflection and is formed below the secondary one.
3. secondary rainbow is due to double internal reflection and is formed above the primary one.
4. secondary rainbow is due to a single internal reflection and is formed above the primary one.
Subtopic:  Total Internal Reflection |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology