how does focal length influence the refraction of light? explain

for lens:

1/f  =(?-1)(1/R₁  -1/R₂)

here, f= focal length of the lens.

?=refractive index

R_1,R_{2=radius of curvature of two faces of the lens}

so if the refractive index of the material opf the lens is more then the focal length will be less. ie light will bend more.