Question
Consider the situation described in the previous problem. Show that the force on the sphere due to the light falling on it is the same even if the sphere is not perfectly absorbing.
✓
Answer
For a perfectly reflecting solid sphere of radius ‘r’ kept in the path of a parallel beam of light of large aperture with intensity ‘I’, force exerted $=\frac{\pi\text{r}^2\text{I}}{\text{C}}$
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