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A pinhole camera forms an image of size 10cm.The object is 5m tall and 20cm away from the pinhole camera. Find the length of the pinhole camera 

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1/f = 1/v - 1/u

1/v = 1/u

1/10 = 1/20

1/v = 1/u

1/10 = 1/20

2/20 = 1/20

2 = 10
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