A perfecting reflecting mirror has an area of 1cm2. Light energy is allowed to fall on it for an hour at the rate of 10 Wcm-2. The force that acts on the mirror is

Given: -


Area of the mirror = 1 cm2,


Power transmitted to the mirror = 10 Wcm-2,


Calculations: -


The average force is given by ,


Since the surface is perfectly reflecting we can write


So




6.7×10-8 N

3