An introduction to the science & practice of photography (1888)
Jones, Chapman · London : Iliffe & Son · leaf 82
glass and looking at its reflection obliquely. The refraction or bending of the pencil of light, as it enters the glass, is discussed in the next chapter. A concave mirror causes the pencils of light that im- pinge upon it to converge, the law that the angles of incidence and reflection are equal… … Fig. 6.
Photography
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