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d<br />

=<br />

Topografia<br />

Strumenti (parte III)<br />

D f<br />

D − f<br />

Prof. Anna Spalla<br />

Università <strong>di</strong> Pavia<br />

f = ff1 1<br />

f 1f 1f2 2<br />

+<br />

f 2<br />

− l<br />

si fa variare la <strong>di</strong>stanza l fra le due lenti<br />

L 1 e L 2 , e quin<strong>di</strong> la focale f<br />

fino ad ottenere d = l 0<br />

d = l 0 = 0 =<br />

D<br />

D −<br />

f 1<br />

f 1<br />

f 1f 1f2 2<br />

+ f 2 − l 2 l<br />

f 1f 1f2 2<br />

+ f 2 − l 2 l

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