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When two soap bubbles of radii r1 and r2...

When two soap bubbles of radii `r_1 and r_2 (r_2 > r_1)` are in contact, the radius of curvature of common surface is

A

`r_2-r_1`

B

`(r_2r_1)/(r_2-r_1)`

C

`(r_2-r_1)/(r_2r_1)`

D

`(r_1r_2)/(r_2+r_1)`

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