Respuesta :

Explanation:

There are two types of lens. They are as follows:

  1. Concave lens
  2. Convex lens

Converging lens is also known as a convex lens. The image formed by a convex lens is real and inverted. When the object is placed between the focus F₁ and the optical center O, the formed image is virtual and erect.

A concave lens is also called as a diverging lens. The image formed by a concave lens is virtual and erect always.

s separated by blocks of $2
s with $n$ $2
s in the $n^{\rm{th}}$ block. What