Out of the two Media – Medium 1 and Medium 2, in which is the speed of light more?
Light travels faster in Medium 1, as the refracted ray's deflection from the normal upon entering Medium 2 indicates.

State reason of bending of the refracted ray away from the normal.
Express refractive index of Medium 2 with respect to Medium 1 in terms of speed of light in two media.
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.