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.