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Q: Where is the optical center of a bifocal lens?
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Is optical center is same as the geometric center of a lens?

no it is same


What is the optical center of a zoom lens?

If you look through the lens at a distant point, the point image will not move when the lens is rotated slightly about a vertical or horizontal axis the goes through the nodal point. This is called the optical center. With a thin lens this is close to the geometric center, with a longer complex lens the optical center is buried somewhere inside. The optcial center of a complex lens may or may not be inside an element.


What is the center point of lens called?

axis or optical center


What is optical center of lens?

The optical center of the lens is a point on the axis of a lens is the point where any ray passing through this point, the incident part and the emergent part are parallel. It is important for the proper refraction of light.


Inventor of bifocal glasses?

Benjamin Franklin


Where is the optical center of a Kryptok 22 lens?

It's in the centre of a round segment!


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


A straight line drawn outward from the center of a lens or mirror?

Optical axis. There ya go!


What bi word means having two lenses on one glass?

The term "bifocal" refers to eyeglasses with two distinct optical powers, typically used to correct both nearsightedness and farsightedness in a single lens.


What is optical center of a lens?

optic centre is the geometrical centre of the lens the rays of light passing through this point emerges in the same direction without bending.