State in brief the functions of following parts of the human eye: Iris
Important Questions on The Human Eye and Colourful World
State in brief the functions of following parts of human eye:
Cornea
State in brief the functions of following parts of the human eye:
Ciliary muscles
State in brief the functions of following parts of human eye:
Pupil
A boy uses spectacles of focal length . Name the defect of vision he is suffering from. Which lens is used for the corrections of this effect? Compute the power of this lens.
What are the causes of the following defects of vision and how can they be corrected?
Cataract
What are the causes of the following defects of vision and how can they be corrected?
Presbyopia
A person sitting at the back of a class is not able to see what is written on the blackboard. He, however, sees it clearly when sitting on the front seat at an approximate distance of from the blackboard.
(i) Name the defect of the eye he is suffering from.
(ii) Draw a ray diagram to illustrate the image formation of the blackboard writing by his eye lens when he is seated at the back seat.
