Each morning,a man fills a bucket with cold water and places it outside in the sun light so that in the evening he has warm water to wash with what could he do to use sun'ray effectively to get hot ?

One way the man could use the sun's rays more effectively to heat the water in the bucket is by using a solar water heater. This device uses the sun's energy to heat water more efficiently than simply leaving a bucket of water out in the sun. The man could install a solar water heater on his roof or in his yard to heat the water in the bucket more quickly and effectively. This would allow him to have hot water for washing in the evening without having to wait as long for the water to heat up.