SSC JE Electrical Engineering 26 Sep 2019 Shift 2 Paper

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Question : 116 of 200

Marks: +1, -0

The candle power of a lamp placed normal to a working plane is 60 CP. Find the distance if the illumination is 15 lux.

4 metres
2.5 metres
2 metres
1.5 metres

Solution:

Illumination =

{\cp}/(\distance)^2

∴

15=60/(d)^2

∴

(d)^2=60/15

∴

d^2=4

∴

[d=2m]

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