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ltlinh995
2 năm trước
Vật sáng AB đặt vuông góc với TKHT, cách thấu kính một khoảng d=30cm, ảnh A'B' cách AB một khoảng L=75cm. Hỏi ảnh A'B' là ảnh thật hay ảnh ảo? Vì sao? Tính tiêu cự của thấu kính.
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