Optical effect of a concave lens, c 1990s.

Optical effect of a concave lens, c 1990s.
3 4 c m
40cm
actual image size: 32cm x 26cm

Description

When rays of light pas through a concave lens, the lens bends them so that they diverge, or spread apart. But the eye thinks that the light travels in straight lines, so it sees it as coming from a 'virtual' image. The image is diminished, or smaller than the object'.

© Science Museum / Science & Society Picture Library

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