Benda setinggi 9 cm memiliki bayangan setinggi

Jawaban:

C) 11,25 dioptri

Penjelasan:

Diketahui :

h = 9 cm

h' = 7,2 cm

s = 20 cm

Ditanya : P?

Jawab :

M = h' ÷ h

M = 7,2 ÷ 9

M = 0,8

M = 4/5 kali

s' = M × s

s' = 4/5 × 20

s' = 16 cm

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

1/f = 1/20 + 1/16

1/f = 4/80 + 5/80

1/f = 9/80

f = 80/9 cm

P = 100 ÷ f

P = 100 ÷ (80/9)

P = 100 × 9/80

P = 900/80

P = 11,25 dioptri ✔

Keterangan :

Semoga membantu.

Have a nice day 🙂