Sorry my handwriting isn't good but I'll try to explain fully in the text
The situation I've taken is that there are em waves of intensity I in all of the space perpendicular to the plane of square and I've taken a square of side length $a$ and thickness $t$ which is very small compared to $a$.
In the left situation the mass of the square plate is very low to make any significant curve as a result only em waves within the area $a²$ fall on the square plate.
In the right situation, the mass of the square plate is very high to cause a significant curve in spacetime so the em waves with $(a+2x)²$ area are falling on the square plate
So, is there any way to calculate the value of $a+2x$ theoretically to calculate the value of force due to radiation? (Or its proportionality to density, square length etc) What if we tilt the square and its plane and em waves aren't perpendicular?
