A point source emitting uniformly in all directions is placed above a table-top at a distance of 0'50 m from ic. The luminous flux of the source is 1570 lumen. Find the illuminance at a small surface area of the table-top (a) directly below the source and (b) at a distance of 0-80 m from the source.
A point source emitting uniformly in all directions is placed above a table-top at a distance of 0'50 m from ic. The luminous flux of the source is 1570 lumen. Find the illuminance at a small surface area of the table-top (a) directly below the source and (b) at a distance of 0-80 m from the source.
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Transcribed Image Text:A point source emitting uniformly in all directions is
placed above a table-top at a distance of 0'50 m from ic.
The luminous flux of the source is 1570 lumen. Find the
illuminance at a small surface area of the table-top
(a) directly below the source and (b) at a distance of
0:80 m from the source.
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