Jawabanmu

2014-06-10T20:48:17+07:00
 \frac{1}{f} =  \frac{1}{75} +  \frac{1}{s'}

 \frac{5}{150} -  \frac{2}{150} =  \frac{3}{150} =  \frac{1}{50} =  \frac{1}{s'}

s' = 50cm (jarak bayangan)
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Perbesaran

 \frac{s'}{s} =  \frac{50}{75} =  \frac{2}{3} kali perbesarannya

 \frac{2}{3} =  \frac{h'}{h} 


 \frac{2}{3} =  \frac{h'}{12} 


24 = h'

8 = h' (tinggi bayangan pensil)
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sifat bayangan: terbalik, nyata, diperkecil