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# An isotropic point source of 100 candela is fastened to the ceiling of a room. What is the total luminous flux falling on all the walls and floor?

I solved it in the following way:

Here Luminous intensity(I) = 100 cd, Total solid angle(w) = 2 (pi) steradian

Total luminous flux falling on all the walls and floor = I x w

= 100 x 2(pi)

= 100 x 2 x 3.14

= 628 lumens

Is it right?

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# Luminous flux problem

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