f.3phy---(light)

👨🏻‍🏫 學術台其他 - 科學

Gary Jai

2008-10-25 5:07 am

汽車有一平面後視鏡...鏡寬0.2m...距司機的眼睛0.4m
司機的位置對正後視鏡..汽車後窗在司機的眼睛後面1.4m處..
問司機能看到的後窗寬度是多少?

更新1:

Please explain for this question.__.

回答 (1)

天同

2008-10-25 7:46 am

✔ 最佳答案

The back window is at a distance of (1.4+0.4) m = 1.8 m from the mirror. Thus, its image is 1.8 m behind the mirror.

The driver's eye, mirror and the image of the back window form two similar isosceles triangles.

Hence, w/1.8 = 0.2/0.4
where w is the image width of the back window
i.e. w = 1.8x0.2/0.4 m

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