1
The distance between principal focus and optical center is _____.
2
Medical practitioner who helps in taking care of eyes.
3
It caused by the unevenness of the curvature of lens resulting to blurred vision and headache.
4
It is the reduced ability of the eye muscles to increase the roundness of the lens.
5
It is the reduced ability of the eye muscles to increase the roundness of the lens.
6
It is the bending of light rays.
7
A spherical lens usually has two centers of ________ (C).
8
Farsightedness
9
The ___ axis of a lens is an imaginary line.
10
A type of lens with thicker edges than its middle portion.
11
The principal axis is passing through the ______ center of the lens.
12
A type of lens with thicker middle portion than its edges.
13
An optical instrument that gives a permanent image of the object.
14
nearsightedness
15
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.
