Question

Hey guys !!!

what is equivalent power and equivalent focal length in both case ?

plzz help... ​

Answer 1

reference

use

peq=p1+p2

feq=1/f1+1/f2

in both cases

the f1 and f2 fond by this formula

1/f=(u2/u1-1)(1/R1-1/R2)

u1 is refractive index of medium in which incident ray is there

and u2 where refracted ray

hope so helpful