Which of the following can be used to form a real image?

Question: Which of the following can be used to form a real image?

Concave mirrors are always use for form a real image. When an image is formed on a screen with the help of a mirror it is called a real image. Similarly an image which can not be obtained on a screen with the help of a mirror it is called virtual image. Convex lens forms real image for any object distance greater than its focal length.