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#13605 Bangla Language & Literature General Level 0

একটি লেন্সের ক্ষমতা +2d, ইহার ফোকাস দূরত্ব কত?

  1. A 50 cm
  2. B 0.2 m
  3. C 2 m
  4. D 20 cm
Answer: A - 50 cm

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