Physics · Ray Optics
एक अवतल दर्पण के सामने 20 cm की दूरी पर रखी वस्तु का वास्तविक प्रतिबिंब दर्पण से 20 cm की दूरी पर बनता है। इस दर्पण की फोकस दूरी क्या है?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 130 cm
- 240 cm
- 320 cm✓
- 410 cm
सही उत्तर देखें
20 cm
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