Question

define dioptre what will be the sign used for finding the power of concave and convex lens in which defect will a person wear lens with positive power

Answer 1

Please find the answer attached

Answer 2

Answer:

• The optical power of any curved mirror or lens is measured in unit of diopter.
• It can be measured by reciprocating focal length that is in meters.
• Patients with “myopia or near sightedness” have negative power and converging or concave lenses are useful for correct the problem.
• While patients with hyper metropia or far sightedness have positive power and diverging or convex lenses are helpful to correct this problem of human eye.