Mathematics · Mirror Formula Calculation
The distance between the pole and the object placed in front of a concave mirror is 120 cm. A real and inverted image is formed on a screen at 40 cm from the pole. What is the focal length of this mirror?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1+60 cm
- 2−30 cm✓
- 3+30 cm
- 4−60 cm
Correct answer
−30 cm
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