Science : Ch 11 – The Human Eye and the Colourful World

At noon, the Sun looks white as:

A clear sky appears blue, because:

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:

The bluish colour of water in deep sea is due to:

Power of a lens is the measure of the degree of

When a fine beam of sunlight enters a smoke filled room, smoke particles become visible due to scattering of light by these particles

Power of a lens is

Effect produced by scattering of light by the atmosphere.

The splitting of light into its component colours is called

The sky appears black to an astronaut

The SI unit of Power of a lens is

The emergent ray in a prism bend at an angle to the direction of the

The colour of the clear sky blue due to

The sky appears black to an astronaut as there is no

The refractive index of glass is largest for