Question:medium

An opaque pyramid (shown below), with a square base and isosceles faces, 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 pyramid 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? \begin{center} \includegraphics[width=0.5\textwidth]{03.jpeg} \end{center}

Show Hint

For shadow problems, always think about orthographic projections. A pyramid can project into triangles, trapeziums, pentagons, or a square, but not into an incomplete square with one side missing.
Updated On: Nov 25, 2025
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