![]() ![]() Also, we would not be able to see materials that absorb all light we would only see the absence of light. For example, even though window glass looks clear to us, it still reflects a little bit of light. However, no common material exists that transmits or absorbs all light. Illustrations of light absorption (left), scattered light (middle), and transmitted light (right). On the right side of the white rectangle, the yellow arrows point straight to the right in the same angle as on the left side.įigure 1. Yellow arrows pointing toward the black rectangle from the left symbolize the incident light. The right image shows a white rectangle which represents a transparent material. On the right side of the rectangle, yellow arrows are pointing away from the grey rectangle in random orientation. The middle image shows a grey rectangle, which represents a translucent material. No arrows are seen on the right side of the black rectangle. ![]() The left image shows a black rectangle, which represents an opaque material. As a result, it is not possible to see through an opaque material the only thing you will be able to see is darkness. Others reflect most or some of the incident light. Some of these materials look dark and tend to get warm when left exposed to light. Opaque materials do not let any light pass through (Figure 1, left). Even if the object itself is not clearly visible, you will still be able to see light as brightness through a translucent material. Although you can see through a translucent material, the scattering of the light results in a blurry image of any object that is placed behind a translucent material. A translucent material also allows light to pass through, but the transmitted light is scattered in all directions (Figure 1, middle). Transparent materials themselves appear clear, which is why you can clearly see any object behind a transparent material. Materials that let all or most of the light pass through are called transparent (Figure 1, right). When a material transmits light, it allows light to pass through. Materials can transmit, absorb, scatter, or reflect light. These classifications are based on how the materials interact with light that shines on them. We can categorize materials by their appearance, like transparent, translucent, or opaque dark or light colored glossy or matte finish, etc. This lesson focuses on these aspects of NGSS Three Dimensional Learning: Plan and conduct investigations to determine the effect of placing objects made with different materials in the path of a beam of light. This lesson helps students prepare for these Next Generation Science Standards Performance Expectations:
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