You can duplicate images, equations, and characters added to a slide in Slide View.

 

To copy an image or equation:         
  1. Select one or multiple images and equations on the slide.

    To select several items, click them while holding down the Shift or Ctrl button or select the area with the objects.

  2. Right-click the selected objects and choose one of the actions in the menu: Copy.

The action will be applied to the selected images or equations. Then click Paste and the copied image will get pasted.