Focal length of eye lens can be adjusted by action of
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Answer:
Focal length of eye lens can be adjusted by the action of ciliary muscles and it is known as the power of accommodation.
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Answer:
Ciliary Muscles
Explanation:
>> Ciliary Muscles are smooth muscle in the eye's vascular layer.
>> The parasympathetic activation of the muscarinic receptors causes ciliary muscle to contradict.
>> When ciliary muscle contracts, the lens becomes more spherical thereby increasing focussing power.
>> When muscle is relaxed the lense becomes flattened which in a way reducing the focussing power.
Resolving power: Ability of the eye to defrentiate between two points are called resolving power.
- When rays divert from particular source,then they are made to meet again at a point, here is where an image is formed. This is the retina of our eyes.
- If you can see the things close by but can't see things far away, this is called Myopia or near sightedness.
- If you can see far away but can't see things near by, this is called hypermetropia or far sightedness.
- Astigmatism - Shape of eye in such a way that there is problem in figuring out grids. It could be corrected by cylindrical lense.
Here are some optical aids :-
⇒Magnifier lense.
⇒Telescopic lense.
⇒Tinted lense.
⇒Bifocal lense.
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