The amount of light entering the human eye is controlled by

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

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

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____________________

Bi-focal lens are required to correct

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

One cannot see through the fog, because

A person cannot see distinctly objects kept beyond 2 m. This defect can be corrected by using a lens of power

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

The focal length of the eye lens increases when eye muscles

The defect of the eye in which the eyeball becomes too long is

Which of the following is a natural phenomenon which is caused by the dispersion of sunlight in the sky?

Human eye acts like a

Which of the following phenomena contributes significantly to the reddish appearance of the sun at sunrise or sunset?

The light sensitive cell present on retina and is sensitive to the intensity of light is:

Function of eyelids includes