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Two sources of lights of illuminating po...

Two sources of lights of illuminating powers in the ratio1:2 are placed on a line 2 meter apart. At what point is the spae between them equally illuminated?

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`1.17 m` from the stronger source
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NN GHOSH-PHOTOMETRY-EXERCISES
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  9. An infinite number of lamps, each of luminous intensity 100 cd are pla...

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  15. An electric lamp of 100 cd consumes 0.5 watt of electrical energy per ...

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  16. Find the average illuminance of the irradiated part of an opaque spher...

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