The apparent thickness of a thick plano-convex lens is measured once with the plane face upward and then with the convex face upward. The value will be

What is Plano-convex lens ?

What about the thickness of double convex lens ?

A plano-convex lens (f = 20 cm) is silvered at plane surface. Now focal length will be

The plane face of a plano convex lens is silvered.If mu be the refrative index and R, the radius of curvature of curved suraface, then system will behave like a concave mirror of curvature

The plane face of a plano convex lens is silvered.If mu be the refrative index and R, the radius of curvature of curved suraface, then system will behave like a concave mirror of curvature

Greatest thickness of a plano convex glass lens appear to be 2 cm when observed normally through the plane surface and when observed through the curved face, the greatest thickness is 20//9 cm. If the real thickness be 3 cm, what is the refractive index of the lens ?