Electron diffraction
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Collimated beam
Blazar
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Messier 87
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Parabolic reflector
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Interferometry
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Umbra, penumbra and antumbra
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Laser diode
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Focal length
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Tractor beam
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Lidar
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Gaussian beam
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Beam divergence
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Vacuum tube
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Lunar eclipse
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Decollimation
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