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CGP EDU Academic Team
Published on: August 22, 2026
A point source of light is placed at the centre of curvature of a hemispherical surface. The source emits a power of 
. The radius of curvature of hemisphere is 
and the inner surface is completely reflecting. The force on the hemisphere due to the light falling on it is____ 
Text Solution
Verified by ExpertsThe correct answer is:
4
(4)
Presses due reflecting surface 
Net force 
Area
Now 
From 
Projected Area
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