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(i) At what distance should the lens be ...

(i) At what distance should the lens be held from the card sheet in order to view the squares distinctly with the maximum possible magnifying power ?
(ii) What is the magnification in this case ?
(iii) Is the magnification equal to magnifying power in this case ? Explain.

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(a) Maximum magnifying power is obtained when the image is at the near point (25 cm)
`u = - 7.14 cm.`
(b) Magnitude of magnification `= (25// |u|) = 3.5.`
(c) Magnifying power = 3.5
Yes, the magnifying power (when the image is produced at 25 cm) is equal to the magnitude of magnification.
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