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Hitunglah panjang minimum suatu cermin yang diharapkan agar seorang penari yang tinggi badannya 160 cm bisa melihat seluruh tubuhnya!

Rani Maharani

Pertanyaan

Jawaban

Panjang minimum cermin dapat ditemukan dengan rumus:

L = 2h / (1 - h/R)

Dimana L adalah panjang cermin, h adalah tinggi benda (yaitu tinggi penari, 160 cm), dan R adalah jari-jari kelengkungan cermin.

Karena R tidak diberikan, asumsikan R adalah infiniti (cermin datar).

Jadi, L = 2 * 160 / (1 - 160 / infiniti) = 320 cm

Panjang minimum cermin untuk melihat seluruh tubuh penari adalah 320 cm.

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