An small object is kept at 18cm from combination of a convex lens and plane mirror to get the image on object itself. Now the space between lens and mirror is filed with liquid of refractive index μL. Now we need to keep the object at 27cm to get the image on object. Find μL.
(1) 4/3
(2) 8/3
(3) 3/2
(4) 7/3
