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A diffraction grating from a plastic bag

We have successfully made a grating from a plastic bag, for use in diffraction experiments, by stretching the plastic bag with various weight forces providing a tensile force. The tensile forces result in empty spaces or slits in the plastic which are similar to the manufactured gratings for diffraction experiments. The experiment shows that the periodic diffraction patterns are formed and appear on the screen when coherent light of 532 nm passes through the grating formed in the plastic bag. The magnitude of the forces affects the distance between the slits of the grating in the plastic bag. According to this study, the larger the force, the larger the distance between the slits of the grating in the plastic bag. We measured the distance between the slits of the plastic bag grating produced by various masses as d1  =  (6.32  ±  0.09)  ×  10−5 m for 500 g, d2  =  (6.99  ±  0.09)  ×  10−5 m for 750 g, d3  =  (7.77  ±  0.20)  ×  10−5 m for 1000 g, d4  =  (8.16  ±  0.13)  ×  10−5 m for 1250 g, d5  =  (11.7  ±  0.11)  ×  10−5 m for 1500 g. This work shows that a simple grating can be made from a plastic bag simply and used in proper experiments.