The fourth exhibition hall named “EXPLORATIONS INTO OPTIC” covers an area of 567 square meters and its main color of the environment is purple, symbolizing the pathway of the optical development is tough and long and also meaning the optical theories constant development in disputes. The exhibition put the optical experiments with high levels of theories first and reveal the theoretical knowledge behind the optics on the basis of experimental phenomenon.
1. 不寻常的世界
Magic world
为什么黑色的花很少？为什么海水是蓝色的？色盲所看到的世界是什么？这个奇异的世界，通过这个展项带给我们有趣的答案。
Why black flowers are rare? Why the sea water is blue? What the world is like in the eyes of a colorblind man? We can find interesting answers by the exhibition about this strange world. 
2. 量子光学大讲堂
The quantum optics classroom
通过卡通动画片，讲解量子光学相关知识，揭示光子的本质，了解光与物质的相互作用，掌握光具有波动性和粒子性的“波粒二象性”性质。
The cartoon animation gives an explanation about the quantum optics and reveals the nature of photon so that the visitors can know more about the interactive effect between light and matter and the properties of light such as the wave-particle duality.

3. 透镜与光线
Lens and rays of light
凹透镜、凸透镜、凹面镜、凸面镜等是几何光学中常见的光学元件。四个镜片依次固定在两个位移台上，通过不同镜片的组合，使观众直观感受光的传播和成像规律。
Concave lens, convex lens, concave mirrors, convex mirror are four common optical elements in geometrical optics. With four lens fixed orderly on two displacement platforms,  the visitors can feel directly the propagation of light and the rules of imaging through the combination of different lens. 

4. 牛顿环
Newton's rings
实验展现牛顿环的现象，说明原理，了解利用牛顿环现象可以检验光学元件表面质量、测量透镜表面曲率半径和液体折射率。
The experiment shows the phenomenon of Newton’s rings and explains its principles. The Newton’s rings can be used to check surface quality of the optical element and measure lens surface radius of curvature and liquid refractive index.

Scanning into the fourth exhibition hall