When studying optics and light, a Three Cornered Mirror can be utilized to experiment with reflection and refraction, explore geometric optics principles, and observe phenomena such as multiple reflections and image formation.

This type of special mirror always reflects the incident ray back to the source, regardless of the angle of incidence. Miniature mirrors of this kind are commonly found in reflectors used on the road and on posts beside it. They consistently reflect back towards the vehicle's headlights, regardless of the angle at which they are illuminated.

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