Question

how was a flea glass invented ? what should it do ?​

Answer 1

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He also made a fleaglass, but called it a microscope', and used it to examine small insects. It was an exciting development. A scientist while watching a drop of water through a powerful microscope, found hundreds of germs in it, This helped the scientist to learn more about the cause of various diseases.

Answer 2

Answer:

Here is the ans hope it's helpful for you☺

Explanation:

These early magnifiers were hence called “flea glasses”. Sometime about the year 1590, two Dutch spectacle makers, Zaccharias Janssen and his father Hans started experimenting with these lenses. They put several lenses in a tube and made a very important discovery.

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