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{{cite book
|title = Photoelectric sensors and controls: selection and application
|author = Scott M. Juds
|publisher = CRC Press
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|page = 29
|url = https://books.google.com/books?id=BkdBo1n_oO4C&pg=PA29&dq=%22diffuse+reflection%22+lambertian#v=onepage&q=%22diffuse%20reflection%22%20lambertian&f=false
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|archiveurl = https://web.archive.org/web/20180114234340/https://books.google.com/books?id=BkdBo1n_oO4C&pg=PA29&dq=%22diffuse+reflection%22+lambertian#v=onepage&q=%22diffuse%20reflection%22%20lambertian&f=false
|archivedate = 2018-01-14
}}</ref> The rays represent [[luminous intensity]], which varies according to [[Lambert's cosine law]] for an ideal diffuse reflector.
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