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f= 20 cm
Ditanyakan: M (Perbesaran)?
1/s= 1/f -1/s'
1/s= 1/20 - 1/30
1/s= 3/60 - 2/60
1/s= 1/60
s= 60 cm
M= | -s'/s |
M= | -30/60 |
M= 30/60= 0,5 kali
Jadi perbesarannya 0,5 kali
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