August 2018 1 40 Report
Bayangan yang di bentuk cermin cekung mempunyai perbesaran 2 kali.jika jarak benda ke cermin 20cm,makaa hitunglah jarak fokus cermin

indeks bias suatu zat n . bila cepat rambat cahaya di udara 3 x 10pangkat8 m/s,maka hitunglah cepat rambat cahaya pada zat tersebut

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