Two glasses with refractive indices of `1.5 & 1.7` are used to make tow identical double-convex lenses.
(i) Find the ratio of their lenghts.
(ii) How will each of these lenses act on a ray parallel to its optical axis if the lenses are submerged into a transparent liquid with a refractive index of `1.6` ?

Answer

(i) `7//5`
(ii) In this liquid the `1^(st)` lens will be diverging & the `2^(nd)` a converging one

Explanation

NA