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Amazon.com : Long Range Laser Pointer for Stargazing Camping Hiking, USB Rechargeable Laser Pen Green Laser Pointer High Power with Laser Beam[5000 FT] Star Cap for Cats Dogs Outdoor Play and Exercise-Silver
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Amazon.com : Long Range Laser Pointer for Stargazing Camping Hiking, USB Rechargeable Laser Pen Green Laser Pointer High Power with Laser Beam[5000 Feet] Star Cap for Cats Dogs Outdoor Play and Exercise-Blue
How does the power of a laser beam depend on one's distance from the source? Does it obey the inverse square law? - Quora
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