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I have an exercise:

A distant camera snaps a photograph of a speeding bullet (speed v) with length b in its rest frame. Behind the bullet and parallel to its path is a meter stick, at rest with respect to the camera. The direction to the camera is an angle $\alpha$ from the direction of the bullet’s velocity. What will be the apparent length of the bullet as seen in the photo? (That is, how much of the meter stick is hidden?)

If I understand it correctly, the idea of the question should go like this:

So the problem is how to find ##b'## as the hidden length?

To solve for the hidden length we should know the time for the shutter I think, however, this is not given in the problem. How do I solve for it?

A distant camera snaps a photograph of a speeding bullet (speed v) with length b in its rest frame. Behind the bullet and parallel to its path is a meter stick, at rest with respect to the camera. The direction to the camera is an angle $\alpha$ from the direction of the bullet’s velocity. What will be the apparent length of the bullet as seen in the photo? (That is, how much of the meter stick is hidden?)

If I understand it correctly, the idea of the question should go like this:

So the problem is how to find ##b'## as the hidden length?

To solve for the hidden length we should know the time for the shutter I think, however, this is not given in the problem. How do I solve for it?

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