Do not use tadalafil with any of the following: certain drugs used to treat chest pain/angina (nitrates such as nitroglycerin, isosorbide), recreational drugs called poppers containing amyl or butyl nitrite.
IT will require two parts to answer your question as it's phrased. The camera's shutter controls the time that light falls on the film, so controls the duration of exposure, a â¦ nd the lens aperture controls the brightness of the light falling on the film. The two functions are used together to get the desired effect.
How the Eye Works. The eye works like a camera. Light rays enter it through the adjustable iris and are focused by the lens onto the retina, a thin light-sensitive layer which corresponds to the film of the camera. The retina converts the light rays into nerve impulses, which are relayed to the visual center.