The curved glass in a pair of spectacles is called a lens. You will find that most spectacles are fitted with plastic lenses rather than glass lenses. The curvature of the lens determines the power/prescription/lens strength. Lens thickness, weight and curvature will vary from person to person depending on what type of prescription they need.
Not all spectacles for myopia are made of glass, and in those that are, any optical-quality glass would work.
The Curved Glass was created in 2001.
the curved glass looked like a lentil
It's just called curved glass.
Not all... Some spectacle-makers use plastic lenses instead of glass.
Telescopes, magnifying glass, spectacles, microscope, camera. There are your five things =)
Spectacles is an older word for eyeglasses. If spectacles were opaque, no one could see through the lenses. The glass (now plastic) used in spectacles must be clear and without scratches.
Curved glass that makes things look larger or closer is a magnifying glass.
Concave or convex lenses
Window, Plastic, Glasses/Spectacles, and a glass cup
you should go to a specialty glass shop.
Eyeglasses.