Visible Light
Light, Sound and Waves

Reflective retinas

Stories from Physics for 11-14 14-16 IOP RESOURCES

The red-eye effect that can appear in photographs is caused by the reflection of the camera flash from blood vessels at the back of the eye. Red-eye reduction systems typically work by firing a number of rapid flashes of light, which cause the subject’s pupils to contract, reducing reflection from the retina.


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