Question

concave lens of refractive index 1.6 is immersed in a medium of refractive index 1.60 whats the nature of lens

Answer 1

Dear student,

From the lens makers formula

1/f = (n-1)[1/R₁ -1/R₂]

Where n, is the refractive index of material of the lens with respect to refractive to refractive index of the medium.

n = n_lens /n _medium

If we take,

refractive index of medium = refractive index of lens material

Then, n= 1

And 1/f =0

So power of lens is zero.

In this condition, the lens disappears in liquid.

Regards