Lesson 2/Learning Event 1
LESSON 2
DETERMINE THE APPLICATION OF OPTICS
TASK
Describe, determine, select, and state the theory and application of optics.
CONDITIONS
Given information about the focal length of a lens and its effect on
perspective, image size, and the angle of view; the terms of optical center,
focal plane, and infinity; and the choice of proper focal length for a given
subject.
STANDARDS
Demonstrate competency of the task skills and knowledge by responding to the
multiple-choice test covering the application of optics.
REFERENCES
TM 11-401
TM 11-401-1
TM 11-401-2
Learning Event 1:
DESCRIBE THE OPTICAL TERMS OF FOCAL LENGTH, FOCAL PLANE, OPTICAL CENTER, AND
INFINITY.
1. In photography, we speak of lens focal length as the distance between
the optical center of lens to the focal plane (film plane) of the camera
when the lens is focused on infinity. To understand this definition it is
essential that you fully understand the terms local plane, optical center,
and infinity.
a. FOCAL PLANE: The surface (plane) on which an image transmitted by a
lens is brought to sharp focus; the surface or area at the back of the
camera occupied by the film (fig 2-1).
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