James Clerck Maxwell membuat serangkaian percobaan dengan menggunakan proyektor cahaya dan penapis (filter) berwarna. three buah proyektor yang telah diberi penapis (filter) warna yang berbeda disorotkan ke layar putih di ruang gelap. Penumpukan dua atau tiga cahaya berwarna ternyata menghasilkan warna cahaya yang lain (tidak dikenal) dalam pencamp

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