If you move a flag away from the source, the resulting shadow will be

If you move a flag away from the source, the resulting shadow will be

• A. Softer
• B. Sharper
• C. Darker
• D. Lighter

Answer: (B)

Moving the flag farther from the light source makes the shadow’s edge crisper. When the light source is close or large, rays from different parts of the source cause a broader penumbra, softening the boundary of the shadow. As the distance increases, the light appears smaller from the flag’s point of view, so the rays that reach the surface come from a narrower range of directions. That reduces the penumbra and yields a more defined, sharper shadow on the surface behind the flag. The overall darkness isn’t the main change here; the defining change is the edge sharpness becoming clearer.

Moving the flag farther from the light source makes the shadow’s edge crisper. When the light source is close or large, rays from different parts of the source cause a broader penumbra, softening the boundary of the shadow. As the distance increases, the light appears smaller from the flag’s point of view, so the rays that reach the surface come from a narrower range of directions. That reduces the penumbra and yields a more defined, sharper shadow on the surface behind the flag. The overall darkness isn’t the main change here; the defining change is the edge sharpness becoming clearer.