Question

has a power
3
A convex lens of refractive index
2
of 2.5 D in air. If it is placed in a liquid of refrac-
tive index 2, then the new power of the lens is
1)-1.25 D
2) -1.5 D
3) 1.25 D
4) 1.5 D​

Answer 1

$\huge\colorbox{yellow}{–\:1.5D}$