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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

`(20)/(3)` lux

B

20 lux

C

`(3)/(20)` lux

D

80 lux

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The correct Answer is:
A
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