Tolomg kk dongggggh​

Jawaban:

4x

Penjelasan:

1/f = 1/s' + 1/s

1/12 = 1/s' + 1/15

1/s' = 1/12 – 1/15

1/s' = 5/60 – 4/60

1/s' = 1/60

S' = 60

Perbesaran = s' : s

= 60 : 15

= 4x