If the laser emits in the visible region then the radiation is perceived as a single colour. The wavelength of light is usually measured in nanometres, or one-thousand-millionth of a metre and is abbreviated to â. â.
A shower or tub equipped with a showerhead shall have a minimum ceiling height of 6 feet 8 inches (2036 mm) above a minimum area 30 inches (762 mm) by 30 inches (762 mm) at the showerhead. The tub/shower is set in an alcove that has as a partial sloped ceiling.
3. Ceiling height Bathrooms must often be shoehorned into tight spaces where ceiling height is less than the general code calls for. For bathrooms, the minimum height is 80â³, except in places where occupants canât walk. In these cases, the ceiling can be even lower. Talk to your building department about what they will or wonât permit. 4.