burning glass

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burning glass

a convex lens for concentrating the sun's rays into a small area to produce heat or fire

burning glass

[′bər·niŋ ‚glas]
(optics)
A converging lens used to produce intense heat by converging the rays of the sun on a small area.
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I inferred that the infinite number of minute bubbles which I had first seen against the under surface of the ice were now frozen in likewise, and that each, in its degree, had operated like a burning-glass on the ice beneath to melt and rot it.
HERE'S an interesting statistic from a 2014 labour survey by burning-glass.
The new beginning made by the women has focussed concentration, like in a burning-glass, on many essential issues of theology and the church that will also be important beyond the situation of women as such.