Week 2 Flashcards
The basic imaging properties such as ___, ____ and ___ are completely determined by the locations of the cardinal points.
image size, location and orientation
The ______ have the property that a ray aimed at one of them will be refracted by the lens such that it appears to have come from the other and with the same angle with respect to the optical axis.
nodal points
Rays propagating to the principal optical axis
continue parallel to the optic axis inside the lens
If the propagating rays are coming from the right, they are subject to
refraction at the principal plane H’. Once it refracts, it exits toward the focal plane F’.
If the propagating rays are coming from the left, they are subject to
refraction at the principal plane H. Once it refracts, it exits toward the focal plane F.
Rays propagating towards the nodal point (N) with angle theta w/respect to the optical acis,
appears to exit from the lens as if it originated from nodal point N’ w/exactly the same angle
Actual rays
are subjected to two refractions, one per refracting surface
Conventional rays
change path only when encounter the principal planes (parallel and focal ray) or the nodal points (the nodal/radial ray).
What is the rule for parallel rays?
Propagate parallel to principal optical axis continue until the principle plane H’; Ray bends (refracts, changing path to primary focus E’
What is the rule for focal rays?
Rays that cross secondary focus E continues until secondary principal plane H where it is bent, changing its path parallel to optical axis.
The ______ in a thick lens are the same as with those in thin lens.
image relationships/imaging
Object location is measured from the ______
principal plane H
Image location is measured from _____
the principal plane H’
What are the steps for imaging with two or more lenses?
- Find the reduced system cardinal points
- Locate image by application of thick ray diagrams
(or employ analytical expressions)
