Mathematics · Ray Optics Calculations
A concave lens produces a virtual image at a distance of −10 cm when the object is placed 30 cm in front of the lens. What is the focal length of the lens?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1−15 cm✓
- 2−20 cm
- 3−7.5 cm
- 415 cm
Correct answer
−15 cm
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