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What are glasses that can focus at two different lengths called?
Bifocals.
Why are bifocals important?
because bifocals are still used today and without bifocals you would have to have 2 pairs of glasses that's why its Important
What building were the bifocals glasses?
You left them in the car.
Where did bifocals glasses take place?
The earliest appearance of Bifocals was when Benjamin Franklin wore them in the 1700's.
What is another name for a two- lens glasses?
Bifocals.
Who invented bioforcal glasses?
Benjamin Franklin invented the bifocals
What Chinese invention did Benjamin Franklin use?
Glasses ...He invented Bifocals .
Where were bifocals invented?
Bifocals were invented by Benjamin Franklin in the United States around 1784. Franklin designed them to help him see both up close and far away without having to switch between different pairs of glasses.
Why are some types of glasses called bifocals?
Because they are bifocals. Bi=two. The lower half lets you see things Close, the upper half lets you see things farther away. Like two glasses in one.
What is the difference between striking straight sided glasses vs circular glasses?
the sound
Why did Benjamin Franklin make bifocals?
So that he would only have to carry one pair of glasses.
What is the name of the glasses which can focus on two lengths at the same time?
They are bifocals good for the one who wants it both in one frame check Eye glassdirect they have great types and collection of it.
