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That experiment sounds iffy:
-8ft after 5.2km is less than 0.5mRad. Very unlikely for a regular green pointer.
-An 8ft dot of 5mW power should be very, very dim. Unfortunately I don't have a focusable one here to test but I seriously doubt it'd be painful to look at.
It's possible they measured wrong and had a way overspec laser, though.
-8ft after 5.2km is less than 0.5mRad. Very unlikely for a regular green pointer.
-An 8ft dot of 5mW power should be very, very dim. Unfortunately I don't have a focusable one here to test but I seriously doubt it'd be painful to look at.
It's possible they measured wrong and had a way overspec laser, though.
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