Express refractive index of Medium 2 with respect to Medium 1 in terms of speed of light in two media.
The relative refractive index of Medium 2 to Medium 1 is calculated using the formula: \[ n_{2/1} = \frac{c_1}{c_2} \] Here:
- \( c_1 \) represents the speed of light in Medium 1,
- \( c_2 \) represents the speed of light in Medium 2.

Out of the two Media – Medium 1 and Medium 2, in which is the speed of light more?
State reason of bending of the refracted ray away from the normal.
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.