A circular area of radius 10 cm is placed at a distance of. 20 m from a point source. The source emits light uniformly in all directions. The line joining the source to the centre of the area is normal to the area. It is found that 20 x 10 lumen of lum inous flux is incident on the area. Calculate the total luminous flux emitted by the Source and the luminous intensity of the source along the axis of the area.
A circular area of radius 10 cm is placed at a distance of. 20 m from a point source. The source emits light uniformly in all directions. The line joining the source to the centre of the area is normal to the area. It is found that 20 x 10 lumen of lum inous flux is incident on the area. Calculate the total luminous flux emitted by the Source and the luminous intensity of the source along the axis of the area.
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Transcribed Image Text:A circular area of radius 10 cm is placed at a distance
of. 2'0 m from a point source, The source emits light
uniformly in all directions. The line joining the source to
the centre of the area is normal to the area. It is found
that 20 x 10 *lumen of luminous flux is incident on the
area. Calculate the total luminous flux emitted by the
Source and the luminous intensity of the source along the
axis of the area.
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