An electric lamp and a screen are placed on the table in a line at a distance of 1min what positions of convex lens of focal length of f =21cm will the image of lamp be sharp
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Keeping in view that; in displacement method the distance between object and screen is 96cm the ratio of length of two images formed by a convex lens placed between them is 4.84
(i) Ratio of the length of object to the length of shorter image is 11/5.
(ii) Distance between the two positions of the lens is 36cm.
(iii) Distance of the lens from the shorter image is 30 cm.
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