u = object distance, v = image distance.
a) 1/u = 1/4 - 1/5
=> v = 20 cm
=> Distance of stamp from lens = 20 cm
b) Here, magnification = -v/u
= - 5/20 = -0.25
=> Height of image = 0.25 * 3 = 0.75 cm
c) Image is inverted .
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