Physics · Optics
एक लेंस की क्षमता -5 D है। इसकी फोकस दूरी कितनी होगी?
- 120 सेमी
- 2-50 सेमी
- 350 सेमी
- 4-20 सेमी✓
सही उत्तर देखें
-20 सेमी
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