An opaque cylinder (shown below) is suspended in the path of a parallel beam…

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An opaque cylinder (shown below) is suspended in the path of a parallel beam of light, such that its shadow is cast on a screen oriented perpendicular to the direction of the light beam. The cylinder can be reoriented in any direction within the light beam. Under these conditions, which one of the shadows P, Q, R, and S is NOT possible?

Grey opaque cylinder tilted upwards to the right, label Opaque cylinder at upper left, visible elliptical near end and dashed hidden portion of the far circular end.Grey filled circular shadow with P printed inside.Grey filled capsule-shaped shadow with two straight horizontal sides joined by rounded ends, Q printed inside.Grey filled rectangular shadow with R printed inside.Grey filled slanted parallelogram shadow with S printed inside.
  1. A.

    P

  2. B.

    Q

  3. C.

    R

  4. D.

    S

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