General Science Physics Optics

দ্বৈত উত্তল লেন্সের ক্ষেত্রে R1 এবং R2 কীরূপ?

1
ধনাত্মক, ঋণাত্মক
2
ঋণাত্মক, ধনাত্মক
3
ধনাত্মক, ধনাত্মক
4
ঋণাত্মক, ঋণাত্মক

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