Human Eye- Colourful World

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

• is scattered the most by smoke or fog

• is scattered the least by smoke or fog

• is absorbed the most by smoke or fog

• moves fastest in the air

The splitting of white light into different colours on passing through a prism is called

• reflection

• refraction

• dispersion

• deviation

The various angles are labelled in the image. Which angle shows the angle of incidence and angle of refraction, respectively?

• A & D

• B & E

• C & F

• D & F

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

• DISPERSION

• SCATTERING

• INTERFERENCE

• TYNDALL EFFECT

What will be the colours of the A, B and C?

• C: red; B: green; A: violet

• C: violet; B: green; A: red

• C: green; B: violet; A: red

• C: red; B: violet; A: green

Which image shows the deviation of light in a prism?

• I

• II

• III

• IV

When white light enters a glass prism from the air, the angle of deviation is least for

• Blue light

• Yellow light

• Violet light

• Red light

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

• different refractive index for the different wavelengths of each colour

• each colour having the same velocity in the prism

• prism material having high density

• Scattering of light

Why do stars appear to twinkle at night?

• Because the light of stars travels in a different medium

• Because the distance of a star varies when the earth rotates

• Because the star changes its position relative to the earth

• Because the atmosphere reflects the light at different angles

Which of the following phenomena of light are involved in the formation of a rainbow?

• Reflection, refraction and dispersion

• Refraction, dispersion and total internal reflection

• Refraction, dispersion and internal reflection

• Dispersion, scattering and total internal reflection