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 When were magnifying glasses created?

Answer An Englishman named Roger Bacon discovered the magnifying glass in 1250. Even before Bacon's discovery, primitive variations of the magnifying glass were used. Egyptians used crystals to view small... Read More »
http://www.answerbag.com/q_view/1940657

Top Q&A For: When were magnifying glasses created

How do magnifying glasses start a fire?

Magnifying glasses start fires because they focus the sun's rays on one spot, whereas rays of sunlight come to Earth parallel to each other, according to the Institute of Physics in Scotland. For b... Read More »
http://www.answerbag.com/q_view/2396109

Magnifying Glasses & Science Projects?

Magnifying glasses became commonly used as far back as the thirteenth century. Science projects involving magnifying glasses include experimental projects that require the magnifying properties for... Read More »
http://www.ehow.com/info_7919536_magnifying-glasses-science-projects.html

How many marines were there when they were first created?

When were bifocal glasses invented?

The invention of bifocal glasses is credited to Benjamin Franklin in 1760. However, some historians believe they may have been invented by Benjamin West or Sir Joshua Reynolds in the same year. Bif... Read More »
http://www.answerbag.com/q_view/2048923


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