The focal lengths of the objective and eyepiece of microscope are \...

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The focal lengths of the objective and eyepiece of microscope are \( 1.25 \mathrm{~cm} \) and \( 5 \mathrm{~cm} \) respectively. Find
\( \mathrm{P} \)
the position of the object relative to the objective in
W
order to obtain an angular magnification of 30 in normal adjustment.
(1) \( -1.46 \mathrm{~cm} \)
(2) \( -2.5 \mathrm{~cm} \)
(3) \( 1.46 \mathrm{~cm} \)
(4) \( 2.5 \mathrm{~cm} \)
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