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how can we find the focus ?thanks
You'll have to provide a few more details if you expect an answer.no idea said:how can we find the focus ?thanks
Lenses work by refracting light, which means they bend light as it passes through. This allows the light to converge at a single point called the focal point.
The focal length of a lens is the distance from the lens to its focal point. It is measured in millimeters and determines the magnification and field of view of the lens.
The focal length of a lens can be determined by measuring the distance from the lens to the image produced by an object placed at infinity. This distance is equal to the focal length of the lens.
A converging lens, also known as a convex lens, brings light rays together and forms a real image. A diverging lens, also known as a concave lens, spreads light rays apart and forms a virtual image.
The lens equation, 1/f = 1/u + 1/v, can be used to find the focus of a lens. f represents the focal length, u represents the distance from the object to the lens, and v represents the distance from the lens to the image. By rearranging the equation, the focal length can be calculated as f = 1/(1/u + 1/v).