Final answer:
The statement regarding film packets being torn or defective leading to partial exposure of the film to light is true. Photographic films are sensitive to light and other forms of radiation, which is why proper packaging is essential to protect them from accidental exposure.
Step-by-step explanation:
The statement that torn or defective film packets may allow a portion of the film to be exposed to light is true. This is because photographic films are sensitive to various forms of radiation, including visible light, and if the film packet is compromised, accidental exposure can occur. Wilhelm Roentgen's discovery that x-rays could expose photographic film even when wrapped in dark paper underlines the sensitivity of photographic film to radiation.
In thin film interference, light reflecting from the mount and inner surfaces of a film can be in phase or out of phase, leading to either constructive or destructive interference. The interference pattern depends on the thickness of the film relative to the wavelength of the light, and whether there is a phase change as light rays travel through different media. Therefore, the integrity of the film packaging is critical for avoiding unwanted exposure and maintaining the quality of the film for its intended purpose.