burglar alarm which uses infra red light to help delect a burglar. which of these correct describes and why ? A. a beam of bright light across the poles makes the burglar visible. B. An invisible beam will be locked from reaching the other end. C. Any person walking between the poles would get an electric shock. D. The beam creates a force field that cannot be crossed at all. please give the correct ans will the explanation why.
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A. a beam of bright light across the poles makes the burglar visible.
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