57. The focal length of a spherical, concave mirror is 8 cm. An object is placed at a distance of 24 cm in front of the mirror. How fast does the image move if the object starts to move at speed toward the concave mirror?
(A)
(B) 0.50
(C) 0.25
(D) 0.20
(E) 0.18

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統計: A(2), B(6), C(20), D(1), E(1) #2974220

詳解 (共 2 筆)

#6315287
1/u + 1/v = 1/f 1/(-...
(共 87 字,隱藏中)
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#6367392

橫向放大率=-q/p ➡️看高度變化

縱向放大率=(q/p)的平方 ➡️ 看移動方向上的變化
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