KS3 CIE Light Crossword | KS3 CIE 光学填字复习

📚 KS3 CIE Light Crossword | KS3 CIE 光学填字复习

This bilingual revision guide turns the key ideas of KS3 CIE Light into a crossword-style review. Each section gives a clue, explains the science behind it, and then provides the answer. Use it to test yourself on the core vocabulary and ideas before your assessment.

这份双语复习指南将 KS3 CIE 光学主题的核心概念变成填字游戏式复习。每一节先给出线索，解释其背后的科学原理，再给出答案。你可以在评估前用它检测自己对核心词汇和概念的理解。

1. Light as a Form of Energy | 光是能量的一种形式

Light is a form of energy that travels in straight lines and can move through a vacuum. It does not need particles or a medium to carry it, which is why sunlight reaches Earth across empty space.

光是一种能量形式，沿直线传播，并且可以在真空中传播。它不需要粒子或介质来承载，因此阳光能够穿越空旷的太空到达地球。

We detect light with our eyes. Most objects do not give out light themselves; they are seen because light from a source bounces off them into our eyes.

我们用眼睛探测光。大多数物体本身不发光；我们看见它们是因为来自光源的光从物体表面反射进入眼睛。

Crossword clue: Form of energy detected by our eyes (5 letters). Answer: LIGHT.

填字线索：我们眼睛能探测到的能量形式（5 个字母）。答案：LIGHT。

2. Luminous and Non-luminous Objects | 发光体与不发光体

A luminous object produces its own light. The Sun, a lit candle, a torch bulb and a fire are all luminous sources. A non-luminous object does not produce light; it can only reflect light from a luminous source.

发光体能自己产生光。太阳、点燃的蜡烛、手电筒灯泡和火都是发光源。不发光体不产生光，只能反射来自发光体的光。

The Moon looks bright, but it is non-luminous. We see the Moon because sunlight reflects from its surface. A mirror is also non-luminous, yet it can appear very bright when it reflects light towards us.

月球看起来很亮，但它是不发光体。我们看到月球是因为阳光从它表面反射。镜子也是不发光体，但当它把光反射向我们时，会显得非常亮。

Crossword clue: Word meaning ‘gives out its own light’ (8 letters). Answer: LUMINOUS.

填字线索：意为 “自己发光” 的词（8 个字母）。答案：LUMINOUS。

3. Light Travels in Straight Lines | 光沿直线传播

Light travels in straight lines called rays. We draw a ray as a straight arrow that shows the direction of travel. A narrow beam of light, such as a laser beam, shows this clearly.

光沿直线传播，这些直线称为光线。我们用带箭头的直线表示光线，箭头表示传播方向。激光束等窄光束可以清楚地显示这一点。

Because light travels in straight lines, an opaque object blocks light and creates a shadow. A pinhole camera works because light from the top of an object passes through the pinhole and appears at the bottom of the screen.

由于光沿直线传播，不透明物体会阻挡光并形成影子。针孔照相机的工作原理是：物体顶部发出的光穿过小孔后到达屏幕底部。

Crossword clue: A narrow beam of light used in diagrams (3 letters). Answer: RAY.

填字线索：图中用来表示光的窄光束（3 个字母）。答案：RAY。

4. Reflection and the Law of Reflection | 反射与反射定律

Reflection happens when light bounces off a surface. A plane mirror gives a clear reflection because its surface is very smooth. Rough surfaces scatter light in many directions, so they do not form a clear image.

当光从表面反弹时发生反射。平面镜表面非常平滑，因此能产生清晰的反射。粗糙表面会把光散射到许多

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