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canvas prints pattern canvas prints interference canvas prints plasticware canvas prints non-destructive canvas prints stress canvas prints test canvas prints technology canvas prints eye canvas prints drops canvas prints polarised canvas prints light canvas prints glasses canvas prints spectacles canvas prints googles canvas prints eyeglasses canvas prints

photographs pattern photos interference photos plasticware photos non-destructive photos stress photos test photos technology photos eye photos drops photos polarised photos light photos glasses photos spectacles photos googles photos eyeglasses photos

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Coloured light interference pattern of plastic glasses. When photographed through cross-polarised white light some transparent plastics display coloured interference effects, according to the pattern of residual stress within the plastic (a result of moulding manufacturing). Areas of similar colour represent regions under similar degrees of stress. This phenomenon, known as photoelasticity, is utilised in engineering situations. Plastic models of bridges, gears, axles, etc may be made and subjected to proportional loads in order to predict the stress patterns that might occur in the real objects.

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