Question

name the lens used in periscope​

Answer 1

Answer:

At the bottom of the periscope, the light strikes another mirror and is then reflected into the viewer's eye. This simple periscope uses only flat mirrors as compared to the periscopes used on submarines, which are usually a complex optical system using both lenses and mirrors. Concave mirror is used in flood light.

Answer 2

Answer:

They use both lense......