In the displacement method, a concave lens is placed in
between an object and a screen. If the magnification in the
two positions are m₁ and m₂ (m₁ > m₂), and the distance
between the two positions of the lens is x, the focal length
of the lens is
(a) x/m₁ + m₂
(b)x/m₁ - m₂
(c) x/(m₁ + m₂)²
(d) x/(m₁ - m₂)²
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