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P = 20
mata tdk berakoomodasi , Sn = 25 cm
dit : M ?
Penyelesaian :
P = 100/f
f = 100/P
f = 100/20
f = 4 cm
M = Sn/f
= 25/5
= 5 kali
P =20 dioptri
Dit: M ............?
f = 1/P
f = 1/20
f = 0,05 m
f = 5cm
M = Sn/f ( mata tdk berakomodasi )
M = 25/f
M = 5
jd perbesaran Lup = 5 kali.