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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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S là điểm sáng, S' là ảnh của S cho bởi thấu kính, xy là trục chính của thấu kính. Loại thấu kính t@ơng ứng với ba hình theo
thứ tự trên là:
A. Thấu kính hội tụ, thấu kính hội tụ, thấu kính hội tụ. B. Thấu kính phân kì, thấu kính hội tụ, thấu kính hội tụ.
C. Thấu kính phân kì, thấu kính phân kì, thấu kính hội tụ. D. Thấu kính hội tụ thấu kính phân kì, thấu kính hội tụ.
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trong phản ứng là:
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06.Trong ba hình vẽ sau đây:
rY
Hỡnh 1
rY
Hỡnh 2
rY
Hỡnh 3
S là điểm sáng, S' là ảnh của S cho bởi thấu kính, xy là trục chính của thấu kính. Loại thấu kính t@ơng ứng với ba hình theo
thứ tự trên là:
A. Thấu kính phân kì, thấu kính hội tụ, thấu kính hội tụ.
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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