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The simple answer is 'they do.'

If you were to hold a piece of paper up to direct sunlight, you would be able to the sunlight coming through the paper. The paper is opaque but not completely so, some light does get through. If you were to put a piece of glass on top of this piece of paper you would see it too. Even though glass is transparent to visible light it still has refractive and reflective properties that effect the light that falls on it.

The same is true for x-rays. Flesh and bone is opaque to x-rays but not completely so. Shining x-rays on a limb will show something of the things in it.

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16y ago

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