FAQ

Many different types of lenses are used in optical devices such as cameras, spectacles, microscopes, telescopes, and projectors. Convex lenses are used in eyeglasses to correct farsightedness, which occurs when the distance between the eye's lens and retina is too short, causing the focal point to be behind the retina.

The correct answer is Flint glass. Flint glass, also called Crystal, is heavy and durable glass characterized by its brilliance, clarity, and highly refractive quality. In the optical glass industry, flint glass is any highly refractive lead-containing glass used to make lenses and prisms.

Diffractive Optical Elements (DOE) are phase elements that utilize continuous relief or step structures etched on a substrate based on the theory of light wave diffraction to achieve extremely high diffraction efficiency. Its small size, light weight, multiple design degrees of freedom, and good imaging quality have broad application prospects in optical imaging, optical data storage, laser technology, biomedical and other fields.

Lenses are the optical components that form the basic building blocks of many common optical devices, including cameras, binoculars, microscopes, and telescopes. Lenses are essentially light-controlling elements and so are exploited for light gathering and image formation.