When two soap bubbles of radii r_1 and r_2 (r_2>r_1)coalese, the radius of curvature of common surface is

When two soap bubbles of radii r_1 and r_2 (r_2>r_1)coalese, the radiu

1.	When two soap bubbles of radii r_1 and r_2 (r_2>r_1)coalese, the radius of curvature of common surface is
Answer» `(r_2 - r_1)` `(r_2 + r_1)` `(r_2-r_1)/r_1r_2` `(r_1r_2)/(r_1 - r_2)` ANSWER :D