HUMAN EYE & COLOURFUL WORLD

When white light enters a prism, it gets split into its constituent colours. This is due to

• different refractive index for different wavelength of each colour

• each colours has same velocity in the prism.

• prism material have high density.

• Scattering of light

The air layer of atmosphere whose temperature is less then the hot layer behave as optically

• denser medium

• rarer medium

• inactive medium

• either denser or rarer medium

The deflection of light by minute particles and molecules of the atmosphere in all direction is called ____________ of light.

• scattering

• interference

• tyndell effect

• Reflection

At noon the sun appears white as [NCERT Exemplar Problems]

• 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

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

• moves fastest in air

• is absorbed the most by smoke or fog

• is scattered the least by smoke or fog

• is scattered the most by smoke or fog

Scattering of light by colloidal solution is known as

• Scattering

• Dispersion

• Tyndall effect

• Stability

The colored light that refracts most while passing through a prism is

• Red

• Yellow

• Blue

• Violet

Refraction of light by the earth’s atmosphere due to variation in air density is called

• atmospheric reflection

• atmospheric dispersion

• atmospheric scattering

• atmospheric refraction

One cannot see through the fog, because

• refractive index of the fog is very high

• fog absorbs light

• light is scattered by the droplets

• light suffers total reflection at droplets

Which of the following is a natural phenomenon which is caused by the dispersion of sunlight in the sky?

• Rainbow

• Twinkling of stars

• Advanced sunrise and delayed sunset

• Stars seem higher than they actually are