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thứ tự trên là:
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C. Thấu kính phân kì, thấu kính hội tụ, thấu kính hội tụ.
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B. Phải luôn luôn lớn hơn tiêu cự của vật kính. D. Phải luôn luôn nhỏ hơn tiêu cự của vật kính.
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thứ tự trên là:
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C. Thấu kính hội tụ, thấu kính hội tụ, thấu kính hội tụ.
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B. Thấu kính hội tụ thấu kính phân kì, thấu kính hội tụ.
C. Thấu kính hội tụ, thấu kính hội tụ, thấu kính hội tụ.
D. Thấu kính phân kì, thấu kính phân kì, thấu kính hội tụ.
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