Question

How would a biocinvex lens aopear when placed in a liquid having refractive index as rhat of lens?

Answer 1

The biconvex lens is a converging lens

when it is placed in liquid of same refractive index that of lens it acts like a Transparent or invisible in that particular liquid

Answer 2

$\huge\boxed {ANSWER}$

In case of lenses, refraction takes place. When a lens is immersed in water, the value of refractive index decreases. Hence its focal length increases