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Problem
A thin equi-convex lens is made of glass of refractive index 1.5 and its focal length is 0.2 m. If it acts as a concave lens of 0.5 m focal length when dipped in a liquid, the refractive index of the liquid is a.
17
8
\frac{17}{8}
8
17
b.
15
8
\frac{15}{8}
8
15
c.
13
8
\frac{13}{8}
8
13
d.
9
8
\frac{9}{8}
8
9
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