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Wasif Shah said:
Lenses work by bending or refracting light as it passes through, which causes the light rays to converge or diverge. This allows the lens to focus light and create clear images.
The two main types of lenses are convex (converging) lenses and concave (diverging) lenses. Convex lenses are thicker in the middle and thinner at the edges, while concave lenses are thinner in the middle and thicker at the edges.
The magnification of a lens can be calculated by dividing the image height by the object height. This can also be expressed as the ratio of the image distance to the object distance.
A real image is formed when light rays actually converge at a point, while a virtual image is formed when light rays only appear to converge at a point. A real image can be projected onto a screen, while a virtual image cannot.
Nearsightedness, or myopia, occurs when the eye is too long or the cornea is too curved, causing light to focus in front of the retina. Farsightedness, or hyperopia, occurs when the eye is too short or the cornea is too flat, causing light to focus behind the retina. Both conditions can be corrected with the use of lenses.
