A stable multi-shape light source was formed by projecting PPT on a smartphone,and a pull-out switchable pinhole observer was made to improve the experimental device.The influence of object,pinhole shape,object distance and distance on"pinhole imaging"was comprehensively investi-gated.The experimental device was simple for operation and convenient for material selection.It could be used as both a demonstration experimental device and a self-made experiment for students,which could effectively cultivate students'innovation consciousness and improve students'core quali-ty of physics.
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