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光,到一般人嗰生活中,係一種摸伓到嗰、有顏色嗰、幫人望到東西嗰幅射。
光,到科學上,係一種電磁波,包含肉眼望得倒,同望伓倒嗰。伓同嗰波長決定佢嗰伓同特性,由長至短分別係:無線電波、微波、紅外光、可見光、紫外光、X-光、伽馬射線。
光嗰速度,到真空係每秒 299,792,458 米。
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