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

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:

A student traces the path of a ray of light through a triangular glass prism for diferent values of angle of incidence. On analysing the ray diagrams, which one of the following conclusions is he likely to draw?

Power of a lens is the measure of the degree of

Arjun 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 ,Name two observations which can be explained by the above phenomenon.

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

The sky appears black to an astronaut

The defect in a person can see nearby objects but not far away objects

Astigmatism can be corrected

Rainbow is caused due to

A concave lens of short focal length has greater

The SI unit of Power of a lens is

The colour of scattered light depends on the

The colour of the clear sky blue due to

Visible spectrum is the band of coloured components of a