Question

Tolong dibantu teman
pakai rumus yg jelas

Answer 1

F = 1/2 × R
f = 1/2 × (-30 cm)
f = -15 cm

1/s + 1/s' = 1/f
1/15 + 1/s' = -1/15
1/s' = -1/15 - 1/15
1/s' = -2/15
-2s' = 15
s' = 15 : (-2)
s' = -7,5 cm (di depan lensa)

Jawaban: D

Answer 2

F = fokus
R = jari" kelengkungan
R = -30 cm
s = jarak benda
s = 15 cm
ditanya : s' (letak bayangan) ?

jawab
f = 1/2 × R
f = 1/2 × (-30 cm)
f = -15 cm
subsitusi ke rumus
1/s + 1/s' = 1/f
1/15 + 1/s' = -1/15
1/s' = -1/15 - 1/15
1/s' = -2/15 kalikan silang
-2s' = 15
s' = 15 /-2
s' = -7,5 cm
karena s' negatif jadi bayangan terletak ddpan lensa

Jawaban: D