HHDLMTOYS 1pcs 100x30mm Optical First Surface Reflector Projector Mirror DIY Projector Accessories High Reflectivity Front Surface Mirrors(3mm)
A first surface mirror, also known as a front surface mirror, is an optical grade mirror which provides superior reflection for engineering and scientific applications. Unlike a standard mirror, which is coated on the second surface of the glass, a first surface mirror provides a true reflection with no double image.