Radiology Practice Test

If a film is accidentally struck by light, the film itself will become overexposed and turn black. This is because the extra light overwhelms the film's light-sensitive chemicals, causing them to react and produce a black image. This is different from white spots, which can appear when the film has been exposed to heat or moisture, or transparent areas which result from insufficient light exposure during the developing process. A blurry image may be caused by camera shake or incorrect focus, but it is not directly related to light exposure. Therefore, the correct answer is C.