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P = 5 dioptri
jawab :- P= 100/f
5 = 100/f
f = 20
- letak bayangan di ruang 2
- perbesaran bayangan;
1/f = 1/Si-1/So
1/si = 1/f-1/So
1/si = 1/20 - 1/25
1/Si = 5/100 - 4/100
Si = 100 cm
M = Si/So
M= 100/25
M= 4 kali