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We prove a conjecture of Aanjaneya, Bishnu, and Pal that the minimum number of diffuse reflections sufficient to illuminate the interior of any simple polygon with n walls from any interior point light source is n/2 - 1. Light reflecting diffusely leaves a surface in all directions, rather than at an identical angle as with specular reflections.arXiv:1302.2271v2 fatcat:crx4kkfm45h2fdt3kfrescsz5u