This is the MGM4002, a 40 x 40 mm general purpose grade plane mirror, sourced from Knight Optical. The mirror is rectangular in shape and has a thickness of 3mm, making it a robust and stable optical component.
The mirror is made of soda lime, a common material in optical applications due to its excellent optical properties and affordability. The soda lime used in this mirror is of the 'ru clear' variety, ensuring high transparency and clarity.
The mirror's coating is a key feature. It is coated with Ali/MgF2 on the front, a combination that provides excellent reflectivity across a wide spectrum, from 180nm to 650nm. This makes the mirror suitable for a wide range of applications, including UV use.
The mirror is available for purchase from Knight Optical, and the link provided leads directly to the product page for easy access and purchase.