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Understanding Shadows: Umbra and Penumbra in Physics

Learn about shadows in physics. Shadows are formed when light is obstructed, resulting in an umbra (dark shadow) or a penumbra (gray shadow). Explore the concepts through interactive slides and practice questions. Discover how penumbral shadow causes a partial eclipse on Earth.

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Understanding Shadows: Umbra and Penumbra in Physics

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  1. Physics Review Shadows

  2. Penumbra (grey) Umbra (black) Intro to Optics SHADOWS Shadows are formed when light is obstructed. The light may be totally obstructed thereby forming a dark shadow known as an umbra, or it may be partially obstructed thereby forming a gray shadow known as a penumbra. Click

  3. PRACTICE

  4. Shadows Slide: Penumbra Umbra Penumbra + A) C) + B) D) Click

  5. Penumbra Penumbra Shadows Slide: Click

  6. Shadows Slide: When the moon’s penumbral shadow strikes the Earth, a partialeclipse is produced. In which region/s can a partial eclipse of the sun be seen? A) Region X only B) Region Y only C) Regions X and Z D) Regions X, Y and Z Click

  7. The End … and good luck!

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