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.
Shower Niche Height. The ideal height for a bathtub shower niche sits at chest to eye-level when standing -- a height of around 48 to 60 inches, as this height suits most adults.Set aside a 12-by-24 inch space between studs to hold shampoos, rinses, scrubbers and razors.nstall a niche on an opposite or adjacent wall to the showerhead, so items you can access items without reaching through the shower spray. If you need to access the niche while in the bathtub, consider a second niche lower down, or add height to the niche and shelves for access when taking a shower or bath.