Question

Jika jarak benda 30cm dan jarak bayangan 15cm. jarak fokus cermin adalah .....

Answer 1

1/f = 1/s+1/s'
1/f = 1/30+1/15
1/f = 3/30
1/f = 1/10
f = 10

Answer 2

1/f=1/s+1/s¹
1/f = 1/30 + 1/15
1/f= 1+2/30
1/f = 3/30
f =30/3
f=10