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Sinar datang dan pantul pada ellips
Author:
Untung Trisna S.
Geser titik D. Perhatikan, sinar dari F1 dipantulkan dinding ellips sehingga pantulannya melalui titik F2. Sifat ini digunakan dalam peralatan medis lithotripter, alat untuk memecah batu ginjal tanpa operasi.
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