I. n1*sina1=n2*sina2 II. Çok yoğun ortamdan az yoğun ortama bakarsan cisim uzakta görülür. III. Kırılma indisi 1 in altında olamaz. IV. 3 tane ortam varken aradaki cam bişi değiştirmiyor.
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When I was 8 or 9, I started using bulletin board systems, which was the precursor to the Internet, where you'd dial into... a shared system and shared computers. I've had an email address since the late '80s, when I was 8 or 9 years old, and then I got on the Internet in '93 when it was first starting out.