[amp_mcq option1=”Visible light” option2=”Ultraviolet light” option3=”Infra red light” option4=”Fluorescent” correct=”option2″]
The correct answer is B. Ultraviolet light.
Photoresist is a light-sensitive material that is used in the fabrication of integrated circuits. It is applied to a wafer, which is then exposed to ultraviolet light through a mask. The areas of the photoresist that are exposed to the light are then developed, leaving a pattern of exposed and unexposed areas. The exposed areas are then etched away, leaving behind the desired pattern of features on the wafer.
Visible light is not energetic enough to cause photoresist to react. Infra red light is too long of a wavelength to be absorbed by photoresist. Fluorescent light is a type of visible light, so it would not be able to expose the photoresist either.
Ultraviolet light is the only type of light that is energetic enough to cause photoresist to react. This is why it is used in the fabrication of integrated circuits.