The human eye and the colourful world short 1 Flashcards
What is a Retina ?
The human eye’s lens system forms an image on a light-sensitive screen called the retina which has many light-sensitive cells.
What is a Cornea ?
Light enters the eye through a thin membrane called the Cornea.
Diameter of the eye ?
The eyeball is approximately spherical in shape
with a diameter of about 2.3 cm.
What is a Iris ?
A structure called iris is situated behind the cornea. Iris is a dark muscular diaphragm that controls the size of the pupil.
What is a Pupil ?
The pupil regulates and controls the amount of light entering the eye.
What sort of image does the eye’s lens form ?
The eye lens forms an inverted real image of the object on the retina.
The ability of the eye lens to adjust its focal length is called
Accommodation
What is the far point of the eye ?
The farthest point to which the eye can see objects clearly is called the far point of the eye. It is infinity for a normal eye.
What is the angle of deviation ?
When the emergent ray bends at an angle to the direction of the incident ray. The angle formed is called the angle of deviation.
