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So + Si = 40cm
f = 7,5 cm
Ditanya : So ?
Jawab :
1/f = 1/So + 1/Si
1/7,5 = 1/So + 1/(40-So)
1/7,5 = 40 - So + So / (40So-So²)
1/7,5 = 40 / (40So-So²)
40So - So² = 300
So² - 40So + 300 = 0
(So-30)(So-10) = 0
So₁ = 30
So₂ = 10
Jadi, posisi lensa untuk membentuk bayangan adalah pada jarak 10cm atau 30cm dari layar.
semoga membantu, ditunggu bintangnya ^^