Explain the formation of image in our eyes steps by step
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Explain the formation of image in our eyes steps by step
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he human eye contains a biconvex lens that performs two important ... of the human visual system that work hand-in-hand to execute the image forming process. ... professionals describe visual field defects in the neuroscience point-of-view. ... to recognize nearby and distant objects by focusing their images on the retina.
First consider the object - which is represented by a simple red arrow pointing upwards (left-hand-side of diagram).
2.Light leaves the object - propagating in all directions:
It is assumed for simplicity that this is a scattering object, meaning that after light in the area (which may be called "ambient light") reaches the object, it leaves the surface of the object traveling in a wide range of directions.
Light leaving the object in all directions is represented by the small arrows pointing upwards, up-left, up-right (small pink arrows), and downwards, down-left and down-right (small green arrows).
3 Some of the light leaving the object reaches the eye:
Although the object is scattering light in all directions, only a small proportion of the light scattered from it reaches the eye.
The longer strong pink and green lines with the arrows marked along them are called "rays".
They represent the direction of travel of light.
The pink rays indicate paths taken by light leaving the top point of the object (that eventually reaches the retina), while the green rays indicate paths taken by light leaving the lower point of the object (that eventually reaches the retina).
Only two rays are shown leaving each point on the object. This simplification is to keep the diagram clear.
The two rays drawn in each case are the extreme rays, that is those that only just get through the optical system called the eye. These generally represent a cone of light that propagates all the way through the system from the object to the image.
Light changes direction when it passes from the air into the eye:
4.When light traveling away from the object, towards the eye, arrives at the eye, the first surface it reaches is the cornea.
The ray-diagram shows the rays changing direction when they pass through the cornea.
5.Location of Focused Image:
Ray-diagrams generally consist of many rays representing light paths through a series of optical components.
These typically indicate light:
* Leaving an object (often drawn on the left-hand-side of the diagram),
* Passing through a series of optical elements (such as the cornea in this example), then eventually
* Forming an image of the object (often on the right-hand-side of the diagram).
6.The image formed on the retina is inverted:
Notice the orientation of the image:
The object is an upright arrow, whereas the image is of an arrow pointing downwards
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