Acrylic One-way Mirror
One-way mirrors are nifty. They are see-through from the darker side but reflective from the lighter side. This is a piece of 1/8" thick acrylic mirror from Amazon. The distance doesn't make much of a difference with an acrylic mirror - the diffusion is fairly light and doesn't change much.
My favorite reason to use one-way mirrors as diffusors is to build an infinity mirror. Infinity mirror projects are a lot of fun. The way they work is illustrated in the graphic. An LED strip sandwiched between a one-way mirror and a regular mirror will reflect the lights back and forth and make the lights appear to reflect into infinity. The one-way mirror allows you to see through and enjoy the endless reflections.
Here are a few sample projects that use infinity mirrors.
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