Define principal axis of a lens. Draw a ray diagram to show what happens when a ray of light parallel to the principal axis of a concave lens passes through it.

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TextImage Formation by Concave LensMagnification by Spherical LensesRay Diagrams for Image Formation by LensesCBSE PYQ

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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.

TextImage Formation by Concave LensLens Formula and Magnification for Thin Lenses

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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