Draw a ray from the object to the lens that is parallel to the principal axis. Once through the lens, the ray should pass through the principal focus. Draw a ray which passes from the object through ...
Draw a ray from the object to the lens that is parallel to the principal axis. Once through the lens, the ray should pass through the principal focus. Draw a ray which passes from the object through ...
OpenOffice.org's tools for creating diagrams are easy to ignore. For one thing, their controls are extremely small. For another, they are pitifully under-documented in the online help, which plods ...
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