Physics of sight 201-205

When light travelling in a certain medium falls on the surface of another medium, a part of it turns back in

The inability of eye to see the objects clearly is called

To describe the change in speed of light in a medium, the term used is called index of

In human eye, the image is formed

When a ray of light enters from denser medium to rare medium it bends

Light enters the eye through a transparent membrane known as

The reflection by the rough surfaces is called

The lens which is thin at center and thick at edges is

The nature of light is wave as well as particle, thus its nature is

The colored portion of the eye that controls the amount of light reaching the retina is known as

The human eye acts like a

The speed of light in air is approximately

Reflection by smooth surfaces is called

The line passing through the two centers of curvatures of the lens is called

The endoscope used to examine the throat is called

The angle of reflection and the angle of reflection are

The entire light is reflected into the denser medium, which is called total

The distance between the optical center and principal focus is

The core is made of glass or plastic of relatively

 Rough surfaces reflect rays of light in

Speed of light in air/speed of light in a medium is equal to the index of

The condition in which the image is formed behind the retina is called

The endoscope used to examine the stomach is called

In the fiber-optic thread, the refractive index of the inner core is

Some people can not see distant objects clearly without spectacles. This defect is called