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A torch as a light source - Light and sound: Video playlist - BBC Bitesize
A demonstration of how a source of light is required to see objects in the dark.
↗ https://www.bbc.co.uk/bitesize/topics/zk2pb9q/watch/z74hgk7A demonstration of how a source of light is required to see objects in the dark.
↗ https://www.bbc.co.uk/bitesize/topics/zk2pb9q/watch/z74hgk7