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.
Code Minimums. The International Residential Code requires shower stalls in homes to measure a minimum of 30 inches by 30 inches. Keep in mind that this is clear space minus any seats or obstructions -- so if you add a 15-inch-deep seat, your shower must measure at least 45 inches deep by 30 inches wide.