Laser beam from lab laser. Warning notice on front. Aperture is not noisy, it looks this way due to diffraction of coherent light at aperture boundary. Beam made visible by mist sprayed into air. Bright Dark Diffraction Light Physics Physics Labs Ray Red Research Science Aperture Beam Black Close-up Coherent Color Danger Energy Exposure Laboratory Laser Optical Quantum Spectroscopy Technology
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يارب اختبارات  Spectroscopy
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