experiment to prove light travels in a straight line

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1. Experiment to show that light travels in a straight line

   

2. Experiment to show that light travels in a straight line

   

3. Experiment to show that light travels in a straight line

   

4. Experiment to show that light travels in a straight line

   

5. Experiment to show that light travels in a straight line

   

6. Experiment: How Light Travels