A simple diffraction experiment was designed using banana stem as natural grating. Coherent beams of
lasers with wavelengths of 632.8 nm and 532 nm that pass through banana stem produce periodic
diffraction patterns on a screen. The diffraction experiments were able to measure the distances
between the slit of the banana stem, i.e. ##IMG##
[http://ej.iop.org/images/0031-9120/52/2/025009/pedaa589aieqn001.gif] {$d=\left(28.76\pm
0.295\right)\times {{10}^{-6}}\,\text{m}$} for a laser with a wavelength of 632.8 nm and ##IMG##
[http://ej.iop.org/images/0031-9120/52/2/025009/pedaa589aieqn002.gif] {$d=\left(26.62\pm
0.002\right)\times {{10}^{-6}}\,\text{m}$} for a wavelength of 532 nm. Therefore, banana stem could
be used as an easily obtained and low cost grating for diffraction experiments.