å·²ç¥éåå°ç大å£å¾2Rï¼å°å£å¾2råé«H,ææ ·ç®å±å¼å¾çæ形大åå¾L1åå°åå¾L2çé¿åº¦?
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h:(h+H)=r:R,
hR=hr+Hr
h=Hr/(R-r)
L2²=h²+r²,
L2=â(h²+r²)=â[H²r²/(R-r)²+r²];
L2ï¼L1=r:R
L1=RL2/rã
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