Physics

Problem

A thin lens made of glass (refractive index = 1.5) of focal length

f = 16

cm in immersed in a liquid of refractive index 1.42. If its focal length in liquid is

f_1

, then the ratio

f_1/f

is closest to the integer (a) 1 (b) 5 (c) 9 (d) 17