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. 2022 Nov 5;22(21):8523. doi: 10.3390/s22218523

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© 2022 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Overall illumination when $s_{i} = 1 \forall i$ , $Φ_{1 / 2} = 20^{0}$ . (a) Joint illumination for $k = 0$ and $k = 1$ . (b) Illumination only for $k = 1$ .