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Objects and Images
The focal length (f) is related to the distance from the lens to the object (Do) and the distance from the lens to the image that is created (Di) by this equation:
| Subject: Algebra Topics: Expressions and Equations Grades: 6 - 12 Knowledge and Skills: - Can evaluate expressions by substituting values for variables - Can simplify expressions using correct order of operations - Can do basic operations on both sides of an equation in such a way as to preserve the equality |
Download Teacher Guide: Objects and Images (PDF)
Download Student Activity: Objects and Images (PDF)
Algebra in the Real World Movie:
The Starshade
Is there life on planets in other star systems? It's a very old question. But finding the answer may get simpler with a new invention by astrophysicist, professor and inventor Webster Cash.
Running time 5:55 minutes.
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