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.
Beams spaced 4â²-0â³ or more can be at 6â²-6â³ above the floor. Where you have basements with no habitable spaces (bedrooms, kitchen, living, etc) the ceiling can be at 6â²-8â³ and beams and ductwork can be at 6â²-4â³. Where you have the sloped ceilings at least half the room needs to have a ceiling height over 7â²-0â³. In bathrooms you need 6â²-8â³ over the fixtures and a minimum of 30â³x30â³ at that height where you have a showerhead.