Why does it go dark when we turn the lights off?

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Chris Smith put this to physicist Andrew Norton from the Open UniversityAndrew - This is a great question - I love this. The thing you've got to realise is that mirrors aren't 100 percent efficient. A typical mirror will only reflect 90 percent of the light that falls on it. You can get better quality ones that will reflect more. But say your mirror reflects 90 percent of

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