chapter 11 Human eye and colourful world

The image formed by retina of human eye is

• Real and inverted

• Virtual and inverted

• Virtual and erect

• Real and erect

The persistence of vision for human eye is

• 1/10th of a second

• 1/6th of the second

• 1/16th of a second

• 1/18th of a second

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

• Red

• Yellow

• Blue

• Violet

The amount of light entering the human eye is controlled by

• Ciliary muscles

• Pupil

• Cornea

• Iris

The change in focal length of an eye tens is caused by the action of the

• retina

• pupil

• ciliary muscles

• iris

Having two eyes facilitates in

A : Increasing the field of view

B : Bringing three-dimensional view

C : Developing the concept of distance/ size

Then the correct option is/are

• A only

• A and B only

• B only

• A, B and C

Near and far points of a young person normal eye respectively are

• 0 and infinity

• 0 and 25 cm

• 25 cm and infinity

• 25 cm and 150 cm

The ability of eye lens to adjust its focal length to form a sharp image of the object at varying distances on the retina is called____________________

• Power of observation of the eye

• Power of accommodation of the eye

• Power of adjustment of the eye

• Power of enabling of the eye

Bi-focal lens are required to correct

• presbyopia

• astigmatism

• coma

• myopia

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

• atmospheric reflection

• atmospheric dispersion

• atmospheric scattering

• atmospheric refraction