Answer to Question #74661 in Optics for meezan

Question

An insect is placed at the base( at centre ) of a cylindrical vessel and oil of refractive index u =2 is filled upto 10cm then water is poured in vessel upto height 20cm (length of water column 10cm ) if a convex lens of focal length 50cm is placed just above the surface of water then find the location of final image of the insect by this system if the insect starts moving up with speed 18m/s then what will be the speed of the final image just after its leaves the bottom