1. C
2. A
3. B
4. D
5. E
Opaque material refers to common materials that are neither metallic (strong reflections) nor transparent (refractive). Plastic, wood, stone, ceramic are common examples of Opaque materials, and they are the most common type of material.
Materials like air, water, and clear glass are called transparent. When light encounters transparent materials, almost all of it passes directly through them. Glass, for example, is transparent to all visible light. Translucent objects allow some light to travel through them.
A translucent material is an object that you are not able to clearly see through because only some light can pass through.
Reflections is the throwing back by a body or surface of light, heat, or sound without absorbing it.
Refraction is the bending of light (it also happens with sound, water and other waves) as it passes from one transparent substance into another.