Check Point
Answer the following questions:
1. State the difference between umbra and penumbra.
2. Draw a diagram to show the position of the screen so that no umbra is formed on it if the source of is bigger than the obstacle.
3. When do total and partial lunar eclipses occur?
4. When do a solar eclipse occur?
5. State the precautions to be taken for viewing partial or total solar eclipses.
6. What are main characteristics of a shadow?
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Explanation:
1. the penumbra is the lighter portion on the edges.
2invisible but makes objects on which it falls visible.
Light is invisible by itself but makes visible the objects on which it falls
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