An equiconvex lens of focal length 10 cm is cut into two equal halves in thickness. What is focal length of each part?

A equiconvex lens of focal length 30 cm is divided into two equal halves in thickness.find the focal lnegth of eah half.

Define focal length of a lens

Two thin lenses of focal lenths + 10 cm and - 5 cm are kept in contact.What is the focal length and

A diverging lens of focal length f is cut in two identical parts each part forming a plano concave lens. What is the focal length of each part?

A concave lens is kept in contact with a convex lens of focal length 20 cm.The combbination works as a convex lens of focal length 50 cm.Find the power of the concave lens.