the colourful world

At noon the sun appears white as

• light is least scattered.

• all the colours of the white light are scattered away

• blue colour is scattered the most.

• red colour is scattered the most.

Which of the following phenomena of light are involved in the formation of a rainbow?

• Reflection, refraction and dispersion

• Refraction, dispersion and total internal reflection

• Refraction, dispersion and internal reflection

• Dispersion, scattering and total internal reflection

Twinkling of stars is due to atmospheric

• dispersion of light by water droplets

• refraction of light by different layers of varying refractive indices

• scattering of light by dust particles

• internal reflection of light by clouds

The clear sky appears blue because

• blue light gets absorbed in the atmosphere.

• ultraviolet radiations are absorbed in the atmosphere.

• violet and blue lights get scattered more than lights of all other colours by the atmosphere.

• light of all other colours is scattered more than the violet and blue colour lights by the atmosphere.

The danger signals installed at the top of tall buildings are red in colour. These can be easily seen from a distance because among all other colours, the red light

• is scattered the most by smoke or fog.

• is scattered the least by smoke or fog.

• is absorbed the most by smoke or fog.

• moves fastest in air.

Which of the following phenomena contributes significantly to the reddish appearance of the sun at sunrise or sunset?

• Dispersion of light

• Scattering of light

• Total internal reflection of light

• Reflection of light from the earth

The bluish colour of water in deep sea is due to

• the presence of algae and other plants found in water

• reflection of sky in water

• scattering of light

• absorption of light by the sea

The splitting of white light into its component colours is called

• refraction

• reflation

• dispersion

• tyndall effect

Reason behind advance sunrise and delayed sunset

• atmospheric refraction

• total internal reflection

• dispersion

• reflection

While performing the experiment to trace the path of a ray of light passing through a glass prism, four students marked the incident ray and the emergent ray in their diagrams in the manner shown below.

• 1

• 2

• 3

• 4