1 Place the cotton balls in areas where mice are likely to enter your house, by doorways or heat vents, etc. 2  Another helpful deterrent is to grow peppermint plants near the entryways. 3  You can use the mint in cooking as well as it serving a deterrent purpose.
Nov 12, 2015. 20 kilometers (12 miles) for a 1 milliwatt beam. Laser light can travel 20 kilometers (12 miles) per-milliwatt that is contained within the laser.
Laser radiation in the visible region of the spectrum (400-700nm) is absorbed primarily within the retina. An ideal eye can focus a collimated visible beam by as much as 100,000 times. Argon and KTP lasers are typical visible medical lasers.