engineering recuitment MP ITI Training Officer Mock Test 2024 General Science Physics

 উত্তল লেন্সগুলির ফোকাল দৈর্ঘ্য(দূরত্ব) নিম্নলিখিত কোনটি হয়ে থাকে?

1
অসীম
2
শূন্য
3
ধনাত্মক
4
ঋণাত্মক
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