A thin lens is made with a material having refractive index μ=1.5 Both the sides are convex. It is dipped in water (μ=1.33). It will behave like

In air 1f0=μg−11R1−1R2In liquid 1fi= wμg−11R1−1R2 Therefore 1f0=μg−μwμw1R1−1R2If μg>μw⇒No change in nature of lens.  ∴It will behave like a convergent lens in liquid.