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Pham99
2 năm trước
Vật AB vuông góc với trục chính của thấu kính phân kì cho ảnh A 'B' cao 2cm ,cách thấu kính 15cm .Biết thấu kính có tiêu cự là 20cm. a) dựng ảnh, tính khoảng cách từ vật đến thấu kính. b)tính chiều cao của vật AB. c) tính khoảng cách từ ảnh đến vật.
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