Physics · Optics
गोलीय दर्पणों की चिह्न परिपाटी के अनुसार, अवतल दर्पण की फोकस दूरी होती है:
- 1अनंत
- 2शून्य
- 3ऋणात्मक✓
- 4धनात्मक
सही उत्तर देखें
ऋणात्मक
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