My 4 year old asked me and I think it’s a rather good question that I would like to answer so she understands. Thanks 🙏🏻
In: 1926
I’d use a bubble machine as an analogue.
Have her and her friends pop as many bubbles as they can, then tell them the game’s to only pop the large ones, then give them an iPad and have the machine running.
Light is like bubbles that are travelling towards materials, some are excited to see all the bubbles and so will pop them all, those are dark.
Some are indifferent to the bubbles so all the bubbles go through, those are clear.
Some will only pop certain bubbles, letting the rest through, those are coloured.
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