75. Which of the following components converts light into a digital signal?
Answer: D
A webcam converts light into a digital signal.
A webcam is designed to capture light and convert it into a digital signal that can be processed by a computer. This functionality is essential for video communication and recording.
A) Inverter
An inverter is an electronic device that converts direct current (DC) to alternating current (AC). It does not have the capability to convert light into a digital signal, making it irrelevant to the context of this question.
B) OLED
An OLED (Organic Light Emitting Diode) is a technology used primarily for display screens. While it emits light, it does not convert light into a digital signal, thus it is not the correct answer.
C) Digitizer
A digitizer is a device that converts analog signals into digital format. However, it does not specifically convert light into a digital signal; it is more commonly associated with converting physical input into digital data. Therefore, it is not the correct choice.
D) Webcam
A webcam directly captures light through its lens and converts this visual information into a digital signal that can be transmitted or recorded by a computer. This is the primary function of a webcam, making it the correct answer to the question.
Conclusion
The webcam is the only option that directly fulfills the requirement of converting light into a digital signal. In contrast, all other options, including the inverter, OLED, and digitizer, either serve different purposes or do not perform the specific function needed in this context. Thus, the webcam is definitively the correct choice.