Glossary term: 光
Description: 光的本質是電磁輻射。在通常情況下，“光”一般是指波長處在一定範圍內、從而讓我們人類可以用肉眼看到的電磁輻射。人類能看到的光波長大致在380-750納米（nm）之間，不過大多數人對波長短於 400 納米的光敏感度很低。這只是電磁波譜的一個狹窄部分，完整的電磁波譜涵蓋了從伽馬射線（最短）到無線電波（最長）的各種波長。更廣義地說，“光”這個術語有時適用於所有電磁輻射。
光的基本屬性包括強度、傳播方向、頻率、光譜和偏振。光在真空中的速度被定義為每秒299,792,458米，這是自然界的基本常數之一。光的顏色取決於它的波長。在可見光譜中，紫光的波長最短，紅光的波長最長。光有多種來源，包括自然光和人造光，而太陽是地球的主要光源。光是以一份一份的不連續形式發射和吸收的，這樣的一“份”稱為一個光子。光子同時具有波和粒子的特性，這種現象被稱為波粒二象性。
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Term and definition status: The original definition of this term in English have been approved by a research astronomer and a teacher The translation of this term and its definition is still awaiting approval
This is an automated transliteration of the simplified Chinese translation of this term
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