Final answer:
The question seems to be misaligned with physics, as it relates more to health or cosmetology. However, the associated questions involve optics, dealing with focal lengths and mirror images, with a concave mirror's focal length being -10 cm, and a nearsighted man needing to stand 10 cm from the mirror to see clearly when shaving.
Step-by-step explanation:
Understanding Optics in Physics
The question regarding the minimum distance an infrared light must be placed from the client's face during a facial seems not completely relevant to physics directly, as it pertains more to health or cosmetology standards. However, the other provided information appears to relate to optics, a topic within physics concerning the behavior and properties of light and how it interacts with various mediums including lenses and mirrors.
The additional information provided suggests a few distinct questions involving optics, specifically pertaining to focal lengths and mirror images. One question involves a nearsighted man who needs to know how close he must stand to a mirror to see clearly when shaving, while another inquires about the focal length of a mirror if it shows an upright image twice the size of an object placed 10 cm away. The focal length of the mirror in this case is -10 cm. The minus sign indicates that the mirror is concave because it forms a virtual image. For the nearsighted man, the distance he must stand from the mirror is 10 cm, as the mirror will create a virtual image at the same distance behind it, thus within his clear vision range.