A lamp of 40 cd is used to illuminate a ...

A lamp of 40 cd is used to illuminate a point vertically below it at a distance of 0.5 m. To have the same illumination at that point, distance of 10 cd lamp above the point should be

A

0.4 m

B

0.5 m

C

0.25 m

D

0.2 m.

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A lamp of 40 cd is used to illuminate a point vertically below it at a distance of 0.5 m. To have the same illumination at that point, distance of 10 cd lamp above the point should be

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