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Explain please 1. How do I know if an image is real or virtual? 2. What is the difference between refraction and reflection? 3. How

Explain please

1. How do I know if an image is real or virtual?

2. What is the difference between refraction and reflection?

3. How is the focal length of a lens determined? What does the focal length of the lens depend on?

4. Describe how to draw the three rays that determine where an image appears.

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