Light Raypaths and Optic

Light Raypaths and Optic

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Caption: Plate from 18th century encyclopedia showing light raypaths and optical devices for the measurment of light. Also shown is a diagram illustrating change in apparent magnitude (brightness) of the sun or moon due to Earth's atmospheric refraction.

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Keywords: apparent magnitude, earth, encyclopedia, focussing light, illustration, instruments, light, light rays, magic lantern, moon, optics, raypaths, sun

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