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

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:

The red colour of the sun at the time of sunrise and sunset is because:

Power of a lens is the measure of the degree of

Ankit remarked that he has seen wavering of objects when seen through a stream of hot air rising above a tandoor or a fire. He said that the air just above the fire becomes hotter than the air further higher up. He further said that this wavering can also be seen in the earth’s atmosphere as the earth’s atmosphere is not evenly distributed and several observations can be explained on the basis of this phenomenon,name the phenomeoneon

What would have been the colour of sky if the earth had no atmosphere

Power of a lens is

The splitting of light into its component colours is called

Why is red used as the stopping light at traffic signals?

When a person can see faraway objects but not nearby objects.

Astigmatism can be corrected

Rainbow is caused due to

The SI unit of Power of a lens is

The colour of the clear sky blue due to