Focal length of concave mirror: The distance between pole and principal focus. Principal focus of a convex mirror: A point on principal axis from which a beam of light rays appear to diverge after ...

Plano concave mirror is a mirror which is arrange reflective coating on the concave surface of Optical glass plano concave spherical lens substrates.The diameter, thickness, focal length or radius of ...

Turning life upside down: Artist creates fantastical landscape with giant concave mirror . By DAILY MAIL REPORTER Updated: 20:06 EDT, 4 May 2009 ...