How Lasers Work
It's a machine that concentrates light waves over and over again
until it emerges in a truly powerful beam. Starting off with weak
light waves, it adds more light of exactly the same colour so
there is a great amount. The laser makes billions of atoms pump
out trillions of the light particles all at once so they line up to
form a very intense light beam which can be used over and over
again, which is very different from the sun or a lightbulb.
World Record Breaking!
Hong Kong’s nightly show, A Symphony of Lights, is officially
the world’s largest permanent light and sound show. It boasts
laser beams moving in time to music which light up the main
buildings with rainbow colours and dancing lights along Hong
Kong’s Victoria Harbour. The laser beams are intended to
sweep the dark night away and maintain the city’s energy.
https://youtu.be/cVMrVHiJiI4
Photo: Pang Ka Kit
14 SPARK