A collection of lenses intended to make an image at one end of an optical system is known as an eyepiece.
The following table gives types of converging lenses.
object position
image position
at infinity
a single point at F
beyond 2F
real, inverted, smaller, between F and 2F
at 2F
real, inverted, same size, at 2F
between 2F and F
real, inverted, larger, beyond 2F
at F
no image; parallel rays
close than F
virtual, erect, larger, on same side of lens
The following table gives types of diverging lenses.
object position
image position
at infinity
a single point at F on same side of lens
closer than infinity
virtual, erect, smaller, on same side of lens
Eyepiece, Lens Formula, Lens Maker's Formula, Mirror, Optical Aberrations
© 1996-2007 Eric W. Weisstein
