Mathematics · Optics Formulae
What is the combined focal length of two thin lenses placed in contact having powers +2.5 D and -2.0 D?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1-2.0 m
- 2+2.0 m✓
- 3-0.5 m
- 4+0.5 m
Correct answer
+2.0 m
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