Refraction is the change in direction of light when it passes from one medium to another. The working of a lens is based on the refraction of light when they pass through it. Lens is a transparent ...

when an object of size 1cm is placed at a distance of 15cm from a concave mirror of focal length 10cm? An object 2cm high is placed at a distance of 16cm from a concave mirror which produces a real ...

Vertex distance is an essential component when determining the correct power for contact lenses, excimer laser treatments and phakic IOLs. The measurement should always be included in power ...

A Ball Lens consists of a highly transparent spherical ball, usually made of solid glass (fused silica) or another optical material with index of refraction less than 2. Most ball lenses are made with ...