Question

The power of a thin convex lens (n_g = 1.5) is +5.0D, when this lens is dipped in a liquid of refractive index n_l, it behaves like a concave lens whose focal length is 100 cm, then what will be the value of n_l?

Answer 1

Given, n_g = 1.5 = \(\frac{3}{2}\); P_a = +5D