Refraction of Light in Lenses Crossword

A type of lens with thicker middle portion than its edges.
A type of lens with thicker edges than its middle portion.
It is the bending of light rays.
The principal ____ (F) of a convex lens is located on its right side of a ray diagram while in concave lens, is on its left side.
A spherical lens usually has two centers of ________ (C).
The ___ axis of a lens is an imaginary line.
The principal axis is passing through the ______ center of the lens.
The distance between principal focus and optical center is _____.
nearsightedness
Medical practitioner who helps in taking care of eyes.
Farsightedness
It caused by the unevenness of the curvature of lens resulting to blurred vision and headache.
It is the reduced ability of the eye muscles to increase the roundness of the lens.
It makes small object looks bigger so that the human eye can see them.
An optical instrument that gives a permanent image of the object.