The illumination at a point on a working plane directly below the lamp – McqOptions

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1.	The illumination at a point on a working plane directly below the lamp is to be 80 lumens/m2. The lamp gives 180 C.P. uniformly below the horizontal plane. Determine the height at which the lamp is suspended.
A.	5.5 m
B.	1.5 m
C.	0.5 m
D.	3.5 m
Answer» C. 0.5 m

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