Question

Rumus buat cari kekuatan lup ...? please yang tau jawab ya ..

Answer 1

P = sn / f

Ket = P = Kekuatan lensa
        f = fokus (cm)
       sn = jarak baca normal (25 cm)

Kalau yg diketahui M (Perbesaran)
M = si / so
M = si / 25
si = M . 25

1/f = 1/so + 1/si
1/f = 1/25 + 1/25 M
1/f = (M+1) / 25M
f = 25M / (M+1)

P = sn / f
   = sn / (25M / (M+1))
   = 25 (M+1) / 25 M
   = (M+1) / M