burning glass

noun

Definition of burning glass

: a positive lens for producing intense heat by converging the sun's rays approximately to the principal focus of the lens the point of convergence being a very small image of the sun

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“Burning glass.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/burning%20glass. Accessed 21 Sep. 2020.

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