4 A steel wire is coaxially embedded in a glass tube

Last updated: 6/8/2023

4 A steel wire is coaxially embedded in a glass tube external diameter of which is much greater than that of the wire Refractive index of the glass is 4 3 If diameter of the steel wire appears 8 3 mm when looked into the glass tube through its curved surface find the actual diameter of the 2 mm steel wire