Use shiny film or card to make a curved reflector.
Concentrate the reflected light onto a jar of water.
How hot can you get the water?
Does it get hotter if the jar is painted black on the outside? Why, or why not?
Does hanging a sheet of black plastic in the water stop the water from heating up as quickly?
See if you can use a solar reflector to evaporate 100ml of water in less than 1 hour.
How might this application be used in buildings to heat water?
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