In Samsung Galaxy Ace there is no dedicated button which converts the camera flashlight into a torch. In many mobile phones there are dedicated LED and a button pressing it, it can be used as a Torch. In Samsung Galaxy Ace as well one can convert their Smartphone into a nice Torch with the help of a Smart Application which is available in free from the Android Market.
This Application simply converts the Camera Flashlight into a Torch. Try not to continously use this application for long as this will consume lot of battery power. Click on the link below to Download this Tiny Flashlight App from the Android Market.