Question

Difference between object and image by defining convergence and divergane

Answer 1

Answer:

the image is real in case of convergence

the image is virtual in case of divergence

Answer 2

Answer:

In order for you to look at an object as it moves closer to your face, the eyes must rotate inward (converge) toward the object. When looking at a faraway object, they move by rotating outwards towards the ears or diverge. Convergence and divergence are unique eye movements as these are the only eye movements that are not conjugate (meaning the eyes move in the same direction) but are instead termed disconjugate. The brain is constantly rapidly sampling the visual environment, quickly altering between convergence and divergence, then just as quickly holding eye posture so that the image of interest is stabilized on the retina.

Convergence

Convergence is the ability to turn the two eyes inward toward each other to look at a close object. We depend on this visual skill for near-work activities such as desk work at school, working on a smartphone type device, or even in sports when catching a ball.

Convergence requires a coordinated stimulation of some extraocular muscles at the same time others are relaxed. Convergence occurs by stimulation of the medial rectus muscle of both eyes (third cranial [oculomotor] nerve) while simultaneously relaxing the lateral recti (sixth cranial [abducens] nerve).

More than just simple eye movements occur with convergence. When the eyes converge, the focusing (accommodative) system is engaged, and the pupils get slightly smaller. This set of three processes - technically termed convergence, accommodation, and miosis - is known as the near triad.

Divergence

Divergence is the opposite of convergence and is the ability to turn the two eyes outwards to look at a distant object. We depend on this skill for distance activities such as reading the board at school, driving and watching TV.

To diverge, the opposite of the near triad must occur. Now the eyes diverge, accommodation is inhibited, and the pupils slightly dilate.