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प्रश्न
Refractive indices of four media A, B, C and D are given below:
| Medium | Refractive index |
| A | 1.33 |
| B | 1.44 |
| C | 1.52 |
| D | 1.65 |
In which of these four media is the speed of light (i) maximum, and (ii) minimum?
उत्तर
The refractive index of a medium is related to the speed of light as follows:
Refractive index =`"speed of light in vacuum "/"speed of light in a medium"`
Since the speed of light in vacuum is a constant, the refractive index becomes inversely proportional to the speed of light in a medium.
(1)The speed of light is maximum in a medium that has the lowest refractive index, ie., medium A
(2) The speed of light is minimum in a medium that has the highest refractive index, ie., medium D.
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संबंधित प्रश्न
The speed of light in air is:
(a) 3 × 108 cm/s
(b) 3 × 108 mm/s
(c) 3 × 108 km/s
(d) 3 × 108 m/s
A ray of light travelling in water falls at right angles to the boundary of a parallel-sided glass block. The ray of light:
(a) is refracted towards the normal
(b) is refracted away from the normal
(c) does not get refracted
(d) is reflected along the same path
Which of the following diagrams shows the ray of light refracted correctly?
The speed of light in vacuum and in two different glasses is given in the table below:
| Medium | Speed of light |
| Vacuum | 3.00 × 108 m/s |
| Flint glass | 1.86 × 108 m/s |
| Crown glass | 1.97 × 108 m/s |
(a) Calculate the absolute refractive indexes of flint glass and crown glass.
(b) Calculate the relative refractive index for light going from crown glass to flint glass.
What is the speed of light in a medium of refractive index `6/5` if its speed in air is 3,00,000 km/s?
The refractive index of water is:
(a) 1.33
(b) 1.50
(c) 2.42
(d) 1.36
Name a liquid whose mass density is less than that of water but it is optically denser than water.
If in a medium, the speed of light is 1.5 × 108 m/s how much will the absolute refractive index of that medium be?
Match the Columns:
| Column ‘A’ | Column ‘B’ |
| Refractive index of water | (a) 1.31 |
| (b) 1.36 | |
| (c) 1.33 |
Absolute refractive indices of glass and water are `3/2 and 4/3` respectively. If the speed of light in glass is 2 × 108 m/s, the speed of light in water is ______.
