Eyes

Far point and near point of human eye are

• 25 cm and infinity

• 25 cm

• infinity and 25 cm

• Infinity

Diameter of eye ball is

• 2.5 cm

• 25 cm

• 2 cm

• 2.3 cm

Dark muscular diaphragm that controls the size of the pupil is

• Retina

• Iris

• Lens

• Cornea

The ability of the eye lens to adjust its focal length is called

• power of accommodation

• far point

• accommodation

• focal length

Myopia or short sightedness can be corrected using

• convex lens

• multifocal lens

• concave lens

• focal lens

An old person cannot see nearby objects clearly due to loss of power of accommodation of the eye, this condition is called

• presbyopia

• hypermetropia

• myopia

• astigmatism

Path of light becomes visible when light enters a dark and dusty room through a small opening is termed as

• Tyndall effect

• Reflection

• Refraction

• Scattering

.................. is least scattered colour, even by fog and smoke and can be seen as the same colour over a long distance

• blue

• red

• violet

• yellow

The human eye forms the image of an object at its

• iris

• retina

• cornea

• pupil

Change in focal length of an eye lens is caused by the action of the

• retina

• iris

• ciliary muscles

• cornea