A concave lens has a power of -2.0D. It forms an image of an object at a distance of 10 cm from the lens. (a) Find the distance of the object from the lens. (b) Find the magnification produced.

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TextImage Formation by Concave LensLens Formula and Magnification for Thin LensesPower of a Lens

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An object is placed at a distance of 60 cm from a concave lens of focal length 30 cm. Use lens formula to find the position of the image formed in this case.

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The power of a lens 'X' is – 2·5 D. Name the lens and determine its focal length in cm. For which eye defect of vision will an optician prescribe this type of lens as a corrective lens ?

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