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Why may a cast-shadow edge become softer farther from the contact point?

Answer and explanation

Correct answer: Because light spreads more around the edge

The governing concept is the softness of a cast-shadow boundary. Near the contact point, the blocking object is close to the surface, so the shadow edge is usually relatively sharp. Farther away, light from an extended source can spread around the object and partially illuminate the boundary, producing a softer transition. Therefore, option A is correct. Paper thickness, pencil behavior, and a change in object colour do not explain this optical effect.

Related tags

Still Life DrawingCast ShadowSoft EdgeContact PointLight SpreadDrawing BasicsArt EducationClass 9 Mcq

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