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Common Rays in Thin Lenses

an object and...

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an object and screen is fixed at a distance D apart a thin converging lens of focal length f is placed in two positions between them to get the image on screen if the gap between two positions is x and the magnification for two positions is m1 and m2 then (1) f = x / m1 - m2 (2) f = x / m1 + m2 (3) f = x ( m1 + m2 ) / m1m2 (4) f = x ( m1 - m2 ) / m1m2

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