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Physics problems example with solution - Optics - problem 6

A symmetrical biconvex glass lens, with refractive index n = 1.5, focal length f = 30 cm, forms an image of an object placed at 45 cm from it. Specify where the image is formed, its nature, and the linear increase crossbar. Find out the convergence of the lens and its radius.


Solution

From the thin-lens formula we get:





So, the picture is real, and reversed, twice higher than the object, and it forms at the 90 cm in right of the lens:









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