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When did Zacharias invent the microscope?
He made his first simple lens microscope in 1595.
When did Zacharias Jansen invent the microscope?
He made his first simple lens microscope in 1595.
What did the microscope Zacharias Janseen invent look like?
It was a tube with lenses at each end. The magnification ranged from 3X to 9X depending on the size. The eyepiece lens was bi-convex and the far end lens was plano-convex.
Who invented the lenses?
who invented the bifocal lenses
Who is generally credited with the invention of bifocals?
Benjamin Franklin is credited with developing bifocal glasses in 1784. Some historians dispute this claim and it is possible that others were independently developing bifocal lenses around this time.
Inventor of bifocal glasses?
Benjamin Franklin
Did Samuel pirece invent the bifocal?
Franklin did.
Did thomas Jefferson invent the bifocal glasses?
no
Can you change the bifocal prescription on glasses without changing the lens?
No, you cannot change the bifocal prescription on glasses without changing the lens. The lens is what is prescribed by your eye doctor. The frame, however, can be changed.
What is a bifocal lens?
bifocals are glass lens that you place upon your nose & push up. they help you see better & / read
When did benjamin franklin invent bifocal glasses?
1784
What would you use to study organisms in a drop of water?
a bifocal lens
How did bifocal got its name?
Two focal lengths in one lens.
What is the defernition for bifocal?
Bifocal is a type of corrective lens. Bifocal lenses are divided into two sections, usually the top for seeing far away objects and the bottom for seeing nearby objects.
What did Benjamin Franklin invent to improve his eyesight?
He invented bifocal glasses.
What does add hi low med mean in contact lenses?
It means you are using a bifocal contact lens that has a bifocal power of about +1.25 to +1.50. A high add would have the bifocal power of about +2.50.
What did Benjamin Franklin invent to help people see well?
bifocal glasses
