<transcript><audio_167>when you shine the light so it's guaranteed to come back and hit you very bright hit the source very brightly so this is one possibility one of the things you have to pay attention to though is if you'd like to extend the range as much as possible of these</transcript><transcript><audio_168>sensors then remember that of your light at</transcript><transcript><audio_169>a rate of one over d squared one over distance squares right so just usual power dissipation of a propagating wave in three dimensions the amount of energy or power dissipation is</transcript><caption><image_170>The image shows a man standing in front of a green chalkboard in a classroom. He is wearing a blue t-shirt and is holding a whiteboard in his right hand. On the chalkboard, there are various mathematical equations and formulas written in white chalk. The equations appear to be related to physics, as there is a diagram of a light bulb on the left side of the board and a question mark on the right side. The man is pointing to one of the equations with his left hand, as if he is explaining something.</caption><transcript><audio_171>one over the distance squared and so um the further away you move these you know you get a lot of power up very close the further away you move the lower it gets and you have to get the light to essentially travel</transcript> when you shine the light so it's guaranteed to come back and hit you very bright hit the source very brightly so this is one possibility one of the things you have to pay attention to though is if you'd like to extend the range as much as possible of these sensors then remember that of your light at a rate of one over d squared one over distance squares right so just usual power dissipation of a propagating wave in three dimensions the amount of energy or power dissipation is one over the distance squared and so um the further away you move these you know you get a lot of power up very close the further away you move the lower it gets and you have to get the light to essentially travel
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