# In the toolbar there are five type of lenses avaiable. # Drag & Drop the lens to the experiment area to place the lens # Click on the Object to place the object in experimental area # You can add upto two lenses , after added two lenses you can replace the lens by dragging the wanted lens near to the existing lens. # You can Drag the lenses to get ray diagram after adding second lens # Double click on the lens to remove the lens from the experimental area. # There are three types of objects are available here Arrow, Triangle and Rectangle