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The lighted disk illuminates the screen but theres a shadow

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A 8.0--diameter disk emits light uniformly from its surface. 20 from this disk, along its axis, is an 9.0--diameter opaque black disk; the faces of the two disks are parallel. 20 beyond the black disk is a white viewing screen. The lighted disk illuminates the screen, but there's a shadow in the center due to the black disk. What is the diameter of the completely dark part of this shadow?

Reference no: EM13607699

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