An astronomical telescope uses two lenses of \( \mathrm{P} \) power...

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An astronomical telescope uses two lenses of
\( \mathrm{P} \)
powers \( 10 \mathrm{D} \) and \( 1 \mathrm{D} \). Its magnifying power in
W
normal adjustment is:
(1) 10
(2) 20
(3) -20
(4) -10
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