confusing

A plane has a span of 12 metres.It was photographed as it was flying
directly overhead with a camera with a depth of 12cm.In the photo the
span of the plane was same.Can you tell how higher was the plane when
it was snapped?(Rock)

Quote:

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Originally Posted by joyiu

A plane has a span of 12 metres.It was photographed as it was flying
directly overhead with a camera with a depth of 12cm.In the photo the
span of the plane was same.Can you tell how higher was the plane when
it was snapped?(Rock)

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I think there is a problem with your English:

I think you mean it was photographed with a camera with a lense of focal length 12cm, and the span of the image of the plane was also 12 cm.

CB