47. A man is nearsighted and cannot see things clearly beyond 110 cm from his eyes. What is the focal length of the contact lenses that will enable him to see very distant objects clearly?
(A) 50 cm
(B) -50 cm
(C) -110 cm
(D) 110 cm
(E) -30 cm.
詳解 (共 3 筆)
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這是一道關於幾何光學中視力矯正（近視）的...
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“cannot see clearly ...
未解鎖
這是一道關於幾何光學中「視力矯正」的經典...
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