A thin convergent glass lens (mg = 1.5) has a power of + 5.0 D.

Question

A thin convergent glass lens (μ_g = 1.5) has a power of + 5.0 D. When this lens is immersed in a liquid of refractive index μ, it acts as a divergent lens of focal length 100 cm. The value of m must be
(a) 4/3 (b) 5/3 (c) 5/4 (d) 6/5

Answer 1

 The value of m must be