When object is placed at focus of microscope lens, its magnified image is formed at infinity and
magnifying power m = D/f = 25cm/5cm = 5.
Class 12 Physics NCERT Sample Paper Question Session 2024-2025.
In a simple microscope a convex lens of focal length 5 cm is used. Calculate the magnifying power when the object is placed at the focus of the lens.
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For a simple microscope, when the object is at the lens’s focus, the magnifying power (
M) is given by:
M = 1 + D/f
where D = 25cm (near point) and f = 5 cm.
M = 1 + 25/5 = 6
Thus, the magnifying power is 6.
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