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Common Rays in Thin Lenses

A compound mi...

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A compound microscope has two convex lens system with focal lengths 2 cm and 5 cm. An object is 2.5 cm away from the objective lens. The tube length of microscope when magnification is maximum is equal to: (a) 18.2 cm (b) 14.2 cm (c) 8.2 cm (d) 4.2 cm

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