alleryMagnifying power of simple magnifier (image at near point):
AD/f
Bf/D
C1 - D/f
D1 + D/f (where D = 25 cm = near point)
Answer & Solution
Correct answer: D. 1 + D/f (where D = 25 cm = near point)
M = 1 + D/f where D = 25 cm is near point.
(Image at infinity gives M = D/f; image at near point gives 1 + D/f.) Used for hand lenses and watchmaker loupes.
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