A bubble in a glass slab (refractive index1.5) when viewed from one side appears at 5 ~cm and at 2 ~cm from other side then thickness of the slab is

Step-by-step solution

Let the thickness of the glass slab is t and distance of the bubble from one side is x . aligned & x =5 ~cm ---(1) & t-x =2 ~cm --(2) aligned By solving equation (1) and (2), we get, t=7 cm =10.5 ~cm