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so = 30 cm
si = 20 cm
ditanya =
a). R = ...
b). f = ...
c). M = ...
dijawab =
a). 2 / R = 1 / so + 1 / si
= 1 / 30 + 1 / 20
= 2 / 60 + 3 / 60
2 / R = 5 / 60
R = 2 . 60 / 5
R = 24 cm
b). 1 / f = 1 / so + 1 / si
= 1 / 30 + 1 / 20
= 2 / 60 + 3 / 60
1 / f = 5 / 60
f = 60 / 5
f = 12 cm
c). M = -si / so
= -20 / 30
= -0,666... kali pembesaran
= 1/30 + 1/20
= 2/60 + 3/60
= 5/60
= 60/5 = 12
a. R = 2xf
= 2x12
= 24
c. M = f/(s-f)
= 12/(30-12)
= 12/18
= 0,66
Maaf ya kalau salah