A) 4 cd
B) 60 cd
C) 300 cd
D) 720 cd
E) None of these
Correct Answer: C
Solution :
Luminous intensity is the perceived power per unit solid angle, given by \[E=\frac{I}{{{r}^{2}}}\] where, \[I\] is luminous intensity, E the illuminance and r the distance. Given, \[E=12\,\,lux,\,\,r=5\,m\] \[\therefore \] \[I=E{{r}^{2}}=12\times {{(5)}^{2}}=300\,cd\]You need to login to perform this action.
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