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bangydd08
2 năm trước
Đăt 1 vật sáng AB trước 1 thấu kính, cách thấu kính 100cm thì thấu kính cho ảnh ảo A'B'=1/5 AB. Xác định TK trên là TK gì? Tiêu cự bằng bao nhiêu?
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