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2 năm trước
Ảnh A’B’ của một vật sáng AB đặt vuông góc với trục chính tại A và ở trong khoảng tiêu cự của một thấu kính hội tụ là A. ảnh ảo ngược chiều vật. B. ảnh thật cùng chiều vật. C. ảnh ảo cùng chiều vật. D. ảnh thật ngược chiều vật.
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