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
The OAE Multilingual Glossary is a project of the IAU Office of Astronomy for Education (OAE) in collaboration with the IAU Office of Astronomy Outreach (OAO). The terms and definitions were chosen, written and reviewed by a collective effort from the OAE, the OAE Centers and Nodes, the OAE National Astronomy Education Coordinators (NAECs) and other volunteers. You can find a full list of credits here. All glossary terms and their definitions are released under a Creative Commons CC BY-4.0 license and should be credited to "IAU OAE".
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