A thin equiconvex lens is made of glass of refractive index and has focal length

PHYSICS · Single correct · AP · Physics 2: Algebra-based · Geometric Optics · Geometric Optics

Problem

A thin equiconvex lens is made of glass of refractive index

1.5

and has focal length

0.2\,\text{m}

. If it acts as a concave lens of focal length

0.5\,\text{m}

when dipped in a liquid, the refractive index of the liquid is (1)

\frac{17}{8}

(2)

\frac{15}{8}

(3)

\frac{13}{8}

(4)

\frac{9}{8}