LOUISE HUGHES / SCIENCE PHOTO LIBRARY LOUISE HUGHES / SCIENCE PHOTO LIBRARY
Fruit fly compound eye lenses, coloured scanning electron micrograph (SEM). A compound eye consists of many rounded lenses known as ommatidia. Each ommatidium is a simple eye that sends a signal to the fly's brain. All the signals are combined by the insect's brain to form a mosaic view of the world. The image seen is not very sharp but good at detecting movements. Between the lenses are hair-like structures called interommatidial bristles. Magnification: x1300 when printed at 10 centimetres across.
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