Describe an experiment to show that light travels in straight line

Describe an experiment to show that light travels in straight line

• Equal square cards A,B and D are cut from piece of thick paper board each with a hole in the middle.

• When the card are arranged as shown above with their holes in a straight line light passes through and seen on the other end.

• İf the middle card is displaced such that its hole is removed from the line, light is cut of from the other end

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