WebDec 18, 2024 · Seeing a halo around a bright light is a normal response. It is caused by diffraction, a phenomenon in which a beam of light spreads out when it passes through a narrow aperture (a hole that allows light in). In the eye, the pupil is the aperture. The pupil narrows in response to bright light, which results in seeing a ring or halo around the ... WebOct 3, 2016 · The tension strap will resist rotation and keep the beam and joist together. Compression Edge Bracing (unbraced length) When designing a beam, one must also consider how the member will be braced (specifically how the compression edge will be braced) to prevent lateral movement of the beam.
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