Question

am nevoie urgent de problema asta la fizica​

Answer 1

f1=20 cm = lentila convergenta

f2=-5cm= lentila divergenta

$c 1= \frac{1}{f1} = \frac{1}{20} = 0.05cm = 0.5d$

$c2 = \frac{1}{f2} = \frac{1}{ - 5} = - 0.2 = - 2d$

2d>0.5d

b) C=C1+C2

C= 0.5-2

C=-1.5D