Light and seeing

  • Robert Barrass
Part of the Macmillan Master Series book series


Light passes through transparent material (for example, glass) but not through opaque material (for example, wood). If an opaque object is placed in front of a point light source, in a darkened room, a sharp edged shadow is formed in the region of less intense light — indicating that light travels in straight lines (see Figure 17.1). You can imagine light spreading from the point source in all directions, as rays, in straight lines. However, in a diagram (such as Figure 17.1) only those rays needed to show the position of the shadow are represented.


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© Robert Barrass 1991

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  • Robert Barrass

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