The Chamberlain garage door opener replacement safety sensors (2-Pack) help make sure your garage remains safe. The sensors project an invisible light beam across the inside of the garage door to ensure that if anything is coming in or going out, that the door automatically reverses before hitting anything or anyone. 1  Replaces defective or damaged sensors.
A traditional triangular prism is a solid figure which is made up of two triangular bases and three rectangular faces. The two triangular bases face each other and are joined together with the help of three rectangles. Triangular prism is the most useful prism in geometry as well as in optical physics.
An prism is a polyhedron with 2 polygonal bases parallel to each other. The two polygonal bases are joined by lateral faces. The number of lateral faces are equal to the number of sides in the base. The lateral faces in a prism are perpendicular to the polygonal bases. Mostly the lateral faces are rectangle. In some cases the faces may be parallelogram.