a camera using autofocous is 3m away how long is the transit time of the pulse of light from the camera 2objec

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a camera using autofocous is 3m away how long is the transit time of the pulse of light from the camera 2objec

2007-02-12 06:02:29 · 3 answers · asked by Anonymous in Science & Mathematics ➔ Physics

3 answers

It depends upon the medium through which the light is travelling. The initial answer would be correct for light travelling in a vacuum as it travels at 299,792,458 metres per second. The speed of light in air is only slightly slower than the above value for a vacuum, and as such, bearing in mind the tiny distance over which the light you are describing is travelling, a good approximation would be to say that the transit time of light to an object 3 metres away would be 10 Nanoseconds.

2007-02-12 07:35:19 · answer #1 · answered by Anonymous · 0⤊ 0⤋

t = d/v = 18m/3 x 10^8 m/s = 6 x 10^-8 sec

2007-02-12 14:27:42 · answer #2 · answered by bozo 4 · 0⤊ 0⤋

Not a lot, about 1/100,000,000sec.

2007-02-12 14:08:38 · answer #3 · answered by JJ 7 · 0⤊ 0⤋