Physics · Ray Optics
A concave mirror forms a real image at a distance of 20 cm when an object is placed 20 cm in front of it. What is the focal length of this mirror?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 130 cm
- 240 cm
- 320 cm✓
- 410 cm
Correct answer
20 cm
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