Myopia and correction
Myopia means that a person is short-sighted. A person's sight is good at short distances.
SIGHT SHORT IS GREAT
A person who is short-sighted can focus clearly on near objects but cannot focus on distant objects. Distant objects are blurry.
This is caused when an eyeball grows too long or the cornea becomes too steeply curved.
Myopia – light rays focus too far in front of the retina. The retina only receives a blurry image.
Here we can see the light is focused in front of the retina and not on it, which will make the image look blurry.
MYOPIA SIGHT SHORT IS GREAT
If it could, the lens would need to get flatter and therefore thinner so that light does not refract as much. So the problem is as follows:
The way to get the image to focus on the screen is to use a concave lens in front of the convex lens.
The effect of using a concave lens in front of a convex lens is to move the image to the point where it focuses on the screen. This has exactly the same effect as putting a concave lens in glasses in front of an eye that suffers from myopia when you need to see objects at distance.
Using a concave lens in a pair of glasses lengthens `di` (image distance) to the point where it focuses on the retina.
Summary
MYOPIA
Sight short is great
FOCUS SHORT
Use concave glasses (lens)
