A ray of light starting from the air passes through medium A of refractive index 1.50, enters medium B of refractive index 1.33 and finally enters medium C of refractive index 2.42. If this ray emerges out in the air from C, then for which of the following pairs of media the bending of light is least?

1. air-A
2. A-B
3. B-C
4. C-air

Which of the following statements is not true for the scattering of light?

1. Colour of the scattered light depends on the size of particles of the atmosphere.
2. Red light is least scattered in the atmosphere.
3. Scattering of light takes place as various colours of white light travel with different speeds in air.
4. The fine particles in the atmospheric air scatter the blue light more strongly than red. So the scattered blue light enters our eyes.

A ray of light is incident as shown. If A, B and C are three different transparent media, then which among the following options is true for the given diagram?

1. ∠ 1 > ∠ 4
2. ∠ 1 < ∠ 2
3. ∠ 3 = ∠ 2
4. ∠ 3 > ∠ 4

In the diagram given below, X and Y are the end colours of the spectrum of white light. The colour of 'Y' represents the

1. Colour of the sky as seen from Earth during the day.
2. Colour of the sky as seen from the moon.
3. Colour used to paint the danger signals.
4. Colour of sun at the time of noon.