光
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。
光速
光嗰速度，到真空係每秒 299,792,458 米。
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