GCSE Biology 3rd edition
IGCSE Biology 3rd edition Life StudyAdvanced biology

Ommatidium Refracting Light

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Ommatidium Refracting Light

Each ommatidium consists of a lens system formed partly from a thickening of the transparent cuticle and partly from a special crystalline cone. This lens system concentrates light from within a cone of 20, on to a transparent rod, the rhabdom. The light, passing down this rhabdom, stimulates the eight or so retinal cells grouped round it to fire nervous impulses to the brain.

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