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am nevoie urgent de problema asta la fizica​

Am Nevoie Urgent De Problema Asta La Fizica class=

Răspuns :

f1=20 cm = lentila convergenta

f2=-5cm= lentila divergenta

[tex]c 1= \frac{1}{f1} = \frac{1}{20} = 0.05cm = 0.5d[/tex]

[tex]c2 = \frac{1}{f2} = \frac{1}{ - 5} = - 0.2 = - 2d [/tex]

2d>0.5d

b) C=C1+C2

C= 0.5-2

C=-1.5D