Exploring Reflection

Use this sketch to play around with reflection. You can move the blue points, and select what is displayed, and what is hidden. [color=#ff0000]Make sure to answer the questions below. [/color][br]
Can you predict what will happen to the image when you move a) the original, and b) the mirror line?
Is there any way to figure out the mirror line if it is hidden?
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Information: Exploring Reflection