An electric lamp is fixed at the ceiling of a circular tunnel as shown in figure. What is the ratio of the intensities of light at base A and at a point B on the wall
A
1:2
B
C
D
1: 
Text Solution
Verified by ExpertsThe correct answer is:
D
Let R be the radius of the tunnel. Then SA =2R and 
, intensity of illumination at A is
As shown above, the intensity of illumination at B will be
Where 
is the angle 
Therefore 
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