Light from two sources

The English doctor and physician Thomas Young (1773-1889) demonstrated interference between light waves at an historic sun's rays piece of card light spreads out at the edges of the card

Two light waves add to give bright and dark bands.

meeting of the Royal Society of London in 1803. Young inserted a thin piece of card endways into a beam of sunlight entering the room through a hole in a window blind. This effectively created two sources of light. The coloured bands seen on a screen placed behind the card were evidence that interference had taken place.

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