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Statement of a problem № 3992

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Write down the lens maker's formula relating the focal length of a lens to the object and image distances. Explain the sign convention used for the distances involved. Show that as two lenses are brought into contact, the focal length of the combined system, f , can be expressed as 1/f = 1/f1 + 1/f2 where f1 and f2 are the focal lengths of the two separate lenses.

Solution:
Write down the lens maker's formula relating the focal length of a lens to the o

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