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Fresnel lens
it is used in a concave lens
a diverging lens can not be used as a magnifying glass becuase a diverging lens( concave) lens diverges the the rays cousing the image to not be erect, but upside down. While magnifying glass ( convex) is used as it is a converging lens which focuses the rays in one point of an objects making it magnifies and erect.( right way up)
we can use convex lens(having tapered ends) for that. but the magnifying capability depends on the power the lens. A magnifying glass works by creating a magnified virtual image of an object behind the lens. The distance between the lens and the object must be shorter than the focal lenght of the lens for this to occur. Otherwise, the image appears smaller and inverted, and can be used to project images onto surfaces.
Converging, Convex
Fresnel lens
A convex lens.
it is used in a concave lens
a glass one
Magnifying glass is used with this lens
a diverging lens can not be used as a magnifying glass becuase a diverging lens( concave) lens diverges the the rays cousing the image to not be erect, but upside down. While magnifying glass ( convex) is used as it is a converging lens which focuses the rays in one point of an objects making it magnifies and erect.( right way up)
A fresnel lens is a type of magnifying glass itself. NOT the most familiar type like sherlock holmes used. You can find fresnel lenses stuck to the back window of vans, in lighthouse lenses. any magnifying lens that has concentric ridges to achieve the magnification effect only using a thin lens.
250 millimeters in front of the lens
250 millimeters in front of the lens
A converging lens is thin at the ends and thick in the middle. It is called converging because the rays of light passing through it, if parallel, converge at a point the other side. A magnifying glass uses a converging lens.
we can use convex lens(having tapered ends) for that. but the magnifying capability depends on the power the lens. A magnifying glass works by creating a magnified virtual image of an object behind the lens. The distance between the lens and the object must be shorter than the focal lenght of the lens for this to occur. Otherwise, the image appears smaller and inverted, and can be used to project images onto surfaces.
If you mean a hand "magnifying glass", like the one used to inspect stamps, examine diamonds, or enlarge fine print, then yes, that's a convex lens.