The Fresnel lens: An obsolete innovation finds a 21st-century role
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Part 2 looked at the background to Fresnel along with the principle and implementation of his innovative lens. This part extends that investigation by looking at closely related innovations which he developed to maximize the system performance. Improving it further The lens was only part of his solution since the optics needs a near-ideal "point
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The Fresnel lens: An obsolete innovation finds a 21st-century role
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