Mathematics · Optics Formulas
If both the object distance and the image distance from a concave mirror are equal to -20 cm, what is the focal length of the mirror?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 120 cm
- 2-14 cm
- 3-8 cm
- 4-10 cm✓
Correct answer
-10 cm
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