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What effect may be missed if a line behind a transparent bottle is drawn perfectly straight?

Answer and explanation

Correct answer: Refraction caused by glass

The governing concept is refraction through curved transparent material. When light from a background line passes through the bottle’s curved glass and then reaches the viewer, the line can appear displaced, enlarged, compressed, or slightly bent. Drawing it perfectly straight everywhere ignores that optical distortion, so C is correct. A contact shadow belongs near the base, line weight concerns the stroke’s emphasis, and paper texture does not explain a shifted background line. Observation should guide the distortion rather than a rigid assumption.

Related tags

Transparent ObjectsGlass RefractionObservational DrawingLine DistortionSketchingObject ObservationDrawing BasicsArt Education

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