HUMAN EYE AND THE 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 deflection of light by minute particles and molecules of the atmosphere in all direction is called ____________ of light.

• scattering

• interference

• tyndell effect

• Reflection

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

When a white light falls on a triangular prism, the colour of light which will deviate the least is

• violet

• green

• blue

• red

Advanced sunrise and delayed sunset is due to

• Scattering of light

• Atmospheric refraction

• dispersion of light

• reflection of light

Why does the lower part of the child appear so much different in size from the upper part?

• The light rays that travel through water and then into air are refracted.
• The light rays that travel through water and then into air are enlarged.
• The light rays that travel through air and then into water are reflected.
• The light rays that travel through air and then into water are reduced.

What is the time difference between actual sunset and apparent sunset ?

• 2 seconds

• 20 seconds

• 2 minutes

• 20 minutes

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

When white light passes through a prism,

• red bends more, violet bends least

• red bends least, violet bends most

• dispersion doesn't occur

• refraction doesn't occur

The splitting of white light into the seven colors when it passes through a transparent material is called

• Refractrion

• Dispersion

• Reflection

• Diffraction