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(c) the voltagĂŠ ĂcrUSS/Iesistoi(i) How are image distance, object distance and focal length of a lensrelated to each other? Why focal length of convex lens is considered151(ii) An object is placed at a distance of 20 cm from a concave lens of radiuspositive and that of concave lens is considered negative?of curvature of 20 cm. Find the nature and position of the image.rting Snll's laand with the help of a

Answer»

The relation is :1/v - 1/u = 1/fFocal lens of a convex lens is positive as its focus is behind the lens whereas the focus of concave lens is in front of the lens so its focal length is negative.



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