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**[SOLVED] what's the diameter of a fly's eye?**

I'm a maths teacher and in a topic on units and 'big and small numbers', I've set my class various items to estimate, including the diameter of a fly's eye...

Now it's driving me mad, I've spent hours googling to try to find out a reasonable range of answers, I can't find anything, I'd be glad to find ANY answer!

Please help me!