A lens can be used to start a fire by focusing an image of the sun onto a piece of flammable material. Part A All other things being equal, would a lens with a short focal length or a long focal length be better as a fire starter? Drag the terms on the left to the appropriate blanks on the right to complete the sentences. ResetHelp Smaller focal length lens creates an image that is Blank bright.target 1 of 2 To burn fire we need high light intensity, hence we need the image to be brighter, that means the lens with Blank focal length will be more effective.target 2 of 2