Question

How to determine the accuracy with which corrective lenses be produced

Answer 1

Answer:

A technician selects a lens blank with the correct amount of existing curvature so that it corresponds with the patient's prescription. lens is then placed in the generator, or grinding machine, and the flat back of the lens is ground into the correct shape.

Explanation:

Answer 2

Explanation:

It is a form of glass that can converge a ray of light on a fixed point. Through this, a man can able to see an object at a distinct place. Lenses are used in specs and various equipments. Convex lens and concave lens are the two types of lenses.