The refractive index of a material indicates how much it can bend light. A higher refractive index means greater bending of light.
Among the given options:
- Refractive index of diamond ≈ 2.42
- Refractive index of kerosene ≈ 1.44
- Refractive index of Canada balsam ≈ 1.55
- Refractive index of air ≈ 1.0003
Hence, diamond has the highest refractive index.
The correct answer is option (A): Diamond
Give reasons:
(i) The sky appears dark to passengers flying at very high altitudes.
At very high altitudes, passengers are above the atmosphere where there is less scattering of sunlight. As a result, they do not see the scattered blue light and the sky appears dark, similar to the condition experienced by astronauts in space.
(ii) 'Danger' signal lights are red in color.