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What boundary is called the terminator on a sphere?

Answer and explanation

Correct answer: Boundary between direct light and form shadow

On a rounded form, the terminator is the transition boundary where direct illumination stops and the form-shadow family begins. It is determined by the light direction and the sphere’s curvature, not by the cast shadow on the ground. Hence option A is correct. The cast-shadow edge, paper edge and highlight centre describe different features.

Related tags

SketchingTerminatorSphereForm-ShadowDrawing BasicsArt EducationClass 9 Mcq

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