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orekihoutaru
2 năm trước
Mắt của một người có điểm cực viễn Cv cách mắt 50cm. a)Mắt người này bị tật gì ? b)Muốn nhìn thấy vật người này phải đeo kính gì?Có tiêu cự bao nhiêu. c)Điểm Cc cách mắt 10cm, sau khi đeo kính người này nhìn thấy điểm gần nhất cách mắt bao nhiêu (vị trí điểm cực cận mới). cho rằng kính đeo sát mắt.
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