A sphere of radius is exposed to a parallel beam of radiation of intensity $I$  as shown in figure. Choose the correct option(s) of the following.

 

If surface of the sphere is completely absorbing, radiation force on the sphere is  $\frac{I\pi r^2}{c}$

If the surface of the sphere is completely reflecting, radiation force on the sphere is  $\frac{2I\pi r^2}{c}$

If surface of the sphere is partially reflecting with reflection coefficient 0.3 and absorption coefficient 0.7, the radiation force on the sphere is   $\frac{1.7I\pi r^2}{c}$

If surface of the sphere is completely reflecting, radiation force on the sphere is  $\frac{I\pi r^2}{c}$