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Sebuah lensa cekung berkekuatan 2,5 dioptri. Berapakah jarak fokus lensa tersebut?

Rani Maharani

Pertanyaan

Sebuah lensa cekung berkekuatan 2,5 dioptri. Berapakah jarak fokus lensa tersebut?

Jawaban

Jarak fokus lensa cekung (f) dapat ditemukan dengan rumus:

1/f = kekuatan lensa

Dimana kekuatan lensa (d) dalam dioptri. Dalam hal ini, kekuatan lensa adalah 2,5 dioptri.

Jadi, 1/f = 2,5, sehingga f = 1 / 2,5 = 0,4 meter (40 cm)

Jarak fokus lensa cekung tersebut adalah 40 cm.

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