1.
a piece of curved and polished glass or other transparent material that forms an image by refracting and focusing light passing through it
2.
a system of two or more lenses that is used in an optical instrument such as a telescope or camera
3.
the part of the eye that focuses light to produce an image on the light-sensitive cells of the retina. It is nearly spherical and convex on both sides, and sits behind the pupil.
4.
a device that focuses a beam of electrons or radiation other than light
5.
a piece of curved glass or plastic that makes things seem smaller, bigger, or clearer
1.
a piece of curved and polished glass or other transparent material that forms an image by refracting and focusing light passing through it
2.
a system of two or more lenses that is used in an optical instrument such as a telescope or camera
3.
the part of the eye that focuses light to produce an image on the light-sensitive cells of the retina. It is nearly spherical and convex on both sides, and sits behind the pupil.
4.
a device that focuses a beam of electrons or radiation other than light
5.
a piece of curved glass or plastic that makes things seem smaller, bigger, or clearer