Jawabanmu

2014-06-05T15:07:10+07:00
1/f = 1/s + 1/s'
1/f = 1/40 + 1/-200 = 5/200-1/200 = 4/200
f= 200/4 = 50cm = 50/100m

P= 1/f = 1/50/100= 1/50×100= 2 dioptri