1, which can be raised one side.

If it is not parallel to the ceiling, the reflectivity will be worse. You can raise the side, if it is not parallel to the ceiling, the reflection will be smaller.

You can stick a reflective film on the screen. So it won't reflect light.

The word reflection has two meanings. One refers to the phenomenon that light reflects on the surface of matter, which is called reflection.

Second, it refers to the reflected light that changes direction after the light released by the light source is incident on the surface of the material. In the universe, except dark matter, black holes and blackbodies, the surface of any substance, including transparent substances, will reflect light. The reflection angle of plane matter is equal to the incident angle, the normal is parallel, the reflected light is parallel, and the reflected light is large, so the brightness is high.

The reflection angle of the concave-convex surface is not equal to the incident angle, the normals are not parallel, the reflected light is not parallel, and the amount of reflected light is small, so the brightness is low.

Citation interpretation

1, reflecting light.

Wei Wei's Oriental, chapter 6: "After all, it is a moonlit night, and with the reflection of snow, the road is not too dark." The golden butterfly has a small mirror: "A rape flower next to the small mirror is blocked by the sun and can't be illuminated."

2. Reflect light.

The white walls reflect light, and the room looks bright.

3. When the surface of the material absorbs the irradiated light (reflectivity is zero), it will not reflect the light, otherwise it will.

Above content reference: Baidu Encyclopedia-Reflection