An object is placed to the left of a lens, and a real image isformed to the righ

Question

An object is placed to the left of a lens, and a real image isformed to the right of the lens. The image is inverted relative tothe object and is one-half the size of the object. The distancebetween the object and the image is 67.7cm. (a) How far from the lens is the object? do = 1 2---Select---cm^-1cmno units
(b) What is the focal length of the lens? f = 3 4---Select---cm^-1cmno units (a) How far from the lens is the object? do = 1 2---Select---cm^-1cmno units
(b) What is the focal length of the lens? f = 3 4---Select---cm^-1cmno units do = 1 2---Select---cm^-1cmno units

Explanation / Answer

1/f = -1/u + 1/v

f= focal length

u = object distance

v= image distance

u+v = 67.7 cm

magnification = v/u = 0.5

v = 0.5u

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