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 d 1 = (6.32 ± 0.09) × 10 −5 m for 500 g, d 2 = (6.99 ± 0.09) × 10 −5 m for 750 g, d 3 = (7.77 ± 0.20) × 10 −5 m for 1000 g, d 4 = (8.16 ± 0.13) × 10 −5 m for 1250 g, d 5 = (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.
Eksperimen kisi difraksi sederhana dapat dibuat menggunakan batang talas (Colocasia esculenta) sebagai bahan alami kisi difraksi. Kisi difraksi ini dapat digunakan sebagai alternatif pengganti kisi difraksi standar dalam eksperimen fisika. Kisi difraksi terdiri atas sebaris celah sempit yang saling berdekatan dalam jumlah banyak. Penggunaan kisi difraksi standar dalam eksperimen umumnya hanya terbatas pada penentuan panjang gelombang cahaya tampak. Jika seberkas cahaya koheren dilewatkan kisi difraksi maka akan menghasilkan pola difraksi pada layar. Eksperimen kisi difraksi ini digunakan untuk menentukan besarnya konstanta kisi difraksi ( ) pada batang talas. Kisi difraksi batang talas yang digunakan dalam kondisi fresh yang diambil langsung dari pohonnya. Cahaya koheren dari laser hijau dengan panjang gelombang 532 nm disinarkan tegak lurus melalui batang talas. Dengan variasi jarak kisi ke layar ( ) dihasilkan pola gelap terang pada layar. Pola gelap terang tersebut merupakan fenomena difraksi. Hasil eksperimen didapatkan nilai . Oleh karena itu batang talas dapat digunakan secara mudah dengan harga murah untuk eksperimen kisi difraksi.
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