# How Do Corrective Lenses Affect Vision in Myopia?

• jan2905
In summary, a convex lens is thicker in the middle and thinner at the edges, causing light rays to converge and form a real image. A concave lens is thinner in the middle and thicker at the edges, causing light rays to diverge and form a virtual image. A lens magnifies an object by bending light rays as they pass through it, making the object appear larger. The degree of magnification depends on the curvature and thickness of the lens. A converging lens, also known as a convex lens, causes light rays to converge and form a real image. A diverging lens, also known as a concave lens, causes light rays to diverge and form a virtual image. The focal length of a lens can be calculated
jan2905
Sufferers of myopia, nearsightedness, have difficutly resolving distant objects because the lenses in their eyes are too strong. If a myopic person has a prescription of -5 diopters, what image do her corrective lenses crate for distant objects?

P=1/f

I tried this problem and got an "upright, virtual image about 20cm in front of the eyes." Is this correct?

That's the correct answer. Good job.

Yes, your answer is correct. A myopic person with a prescription of -5 diopters would have corrective lenses that create an upright, virtual image located approximately 20cm in front of their eyes. This is because the lenses in their eyes are too strong, causing light to converge too quickly and resulting in a blurred image for distant objects. The corrective lenses help to correct this by diverging the light before it reaches the eye, allowing for a clear image to be formed on the retina. This is a common solution for those with myopia and helps to improve their vision for distant objects.

## 1. What is the difference between a convex and a concave lens?

A convex lens is thicker in the middle and thinner at the edges, causing light rays to converge and form a real image. A concave lens is thinner in the middle and thicker at the edges, causing light rays to diverge and form a virtual image.

## 2. How does a lens magnify an object?

A lens magnifies an object by bending light rays as they pass through it, making the object appear larger. The degree of magnification depends on the curvature and thickness of the lens.

## 3. What is the difference between a converging and a diverging lens?

A converging lens, also known as a convex lens, causes light rays to converge and form a real image. A diverging lens, also known as a concave lens, causes light rays to diverge and form a virtual image.

## 4. How do you calculate the focal length of a lens?

The focal length of a lens can be calculated by dividing the radius of curvature of the lens by 2. It can also be calculated using the lens equation: 1/f = 1/do + 1/di, where f is the focal length, do is the distance between the object and the lens, and di is the distance between the image and the lens.

## 5. What is the difference between a real and a virtual image?

A real image is formed when light rays actually converge at a point, allowing an observer to see a clear and focused image. A virtual image is formed when light rays only appear to converge at a point, and the image can only be seen when looking through the lens.

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