Infrared radiation exposures of 200 W/cm2 at 1090 nm for 8 seconds with a continuous-wave glass fibre laser is demonstrated to induce cataract in less than a week. Whereas a similar experiment using 96 W/cm2 for 1 hour has shown no cataract after 1 week. If the first infrared laser intensity was measured at 300 mm, at what distance is considered safe for not developing cataract after 1 week?
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