a)
if image is real then image distance is +ve, formed on the
opposite side of the lens
(1/f) = (1/dₒ) + (1/dᵢ)
(1/2.41) = (1/dₒ) + (1/13.2)
1/dₒ = 0.33918
dₒ = 2.95 cm [object is between F and 2F]
b)
image is virtual:
(1/2.41) = (1/dₒ) + (1/-13.2)
(1/dₒ) = 0.490
dₒ = 2.038 cm [object is between lens and F(focal point)]
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