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Sagot :
The shutter speed that should be used if the lens is changed to f/4.0 is; Choice D: 1/500 s.
The relationship between the shutter speed and the focal ratio is an inverse relationship.
Ratio of Areas = 5.6²/4²
- A1/A2 = 1.96 = 2
Since; T1A1 = T2A2
- T2 = T1(A1/A2)
- T2 = 250 × 2 = 500 seconds
In essence; when the focal ratio is reduced as in this case; from f/5.6 to f/4.0; the shutter speed is increased.
Ultimately, the shutter speed of the camera in discuss increases to; 1/500 s.
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