Mathematics · Optics Formulas
यदि एक अवतल दर्पण से वस्तु की दूरी और प्रतिबिंब की दूरी दोनों -20 cm के बराबर हैं, तो दर्पण की फोकस दूरी क्या होगी?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 120 cm
- 2-14 cm
- 3-8 cm
- 4-10 cm✓
सही उत्तर देखें
-10 cm
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