Question

Select One Correct Option from the following: A concave lens of glass, refractive index 1.5, has both surfaces of the same radius of curvature R. On immersion in a medium of refractive index 1.75, it will behave as a
(A) convergent lens of focal length 3.5R
(B) convergent lens of focal length 3.0R
(C) divergent lens of focal length 3.5R
(D) divergent lens of focal length 3.0R.

Answer 1

✔️(A) convergent lens of focal length 3.5R

(B) convergent lens of focal length 3.0R

(C) divergent lens of focal length 3.5R

(D) divergent lens of focal length 3.0R.