光学的英文：
optics (math. phys.)
optical (instrument)

Optical fibre / light guide
光学纤维

A kaleidoscope is an optical toy
万花筒是一种光学玩具。

Optical flat
光学平晶

OCR (optical character recognition)
光学字符识别,光学符号识别,[港]光符识别

Optical bleach
利用光学方法进行漂白

The distinctness or clarity of an image rendered by an optical system.
影象的清晰度因使用光学调节系统而形成的分明的或清晰的图象

Optical parallel
光学平行

Optical character recognition
光学字符识别

Optical brightener(Optical brightness agent): Synonymous with Optical bleaching agent.
光学增光剂:即光学漂白剂。

optical sighting device
光学照准器

Optical brightener(Optical brightness agent): Synonymous with Optical bleaching agent.
光学增光剂:即光学漂白剂。

Optical depth and optical path are often confused in the literature.
文献中光学厚度和光程时常混淆。

A computer that is made of optical fiber and various optical elements
一种利用传递光信号的光纤与各种光学元件相结合而制成的计算机。

Usually y is a function in math.
X is not a function in math.

I have a math problem.
我有一道数学题不会做。

I have to revise for maths.
我要复习数学。