Human eye and colourful world

The muscular diaphragm that controls the size of the pupil is

• Cornea

• Ciliary muscles

• Iris

• Retina

The image formed on the retina of the human eye is

• virtual and erect

• real and erect

• real and inverted

• virtual and inverted

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

When light rays enter the eye, most of the refraction occurs at the

• Pupil

• Iris

• outer surface of the cornea

• crystalline lens

In human eye,image is formed on

• Iris

• Cornea

• Retina

• Lens

Scattering of light by colloidal solution is known as

• Scattering

• Dispersion

• Tyndall effect

• Stability