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Inventor of bifocal glasses?
Benjamin Franklin
What tool do scientist use to look at insects?
a bifocal (using both eyes) disecting microscope. probably with zoom lens
How do you use bifocals and television in a sentence?
I used my bifocals to watch the television
Who invent the bifocal lens?
Benjamin Franklin did.
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
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 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.
Why is it that in a pair of bifocal glasses the converging lens at the bottom and the diverging lens at the top?
It is a split screen usually the bottom part is cut as the (close up) lens the normal or larger part of the lens is normal- depending on whether one needs primarily distance or close-up correction, or for reading. the bottom lens group is usually secondary, not the main task. Franklin invented bifocal eyeglasses. He also devised the lightning rod, Franklin stove and *Long arm, lever device often used in grocery stores.
Who invented chromatic lens?
the person who invented the chromatic lens
