67. 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 through its lens and convert that light into a digital signal, allowing images and videos to be transmitted or recorded digitally.
A) Inverter
An inverter is an electronic device that converts direct current (DC) into alternating current (AC). It does not have the functionality to convert light into a digital signal, making it irrelevant to the question.
B) OLED
Organic Light Emitting Diode (OLED) technology is used for display screens and does not convert light into a digital signal. Instead, it generates light itself through electroluminescence, which is the opposite of the process described in the question.
C) Digitizer
A digitizer is a device that converts analog signals into digital data. However, it does not directly convert light into a digital signal; instead, it processes and converts various types of analog information, which may include signals from sensors, but not specifically light.
D) Webcam
A webcam captures light through a lens and uses image sensors to convert that light into a digital signal. This process is essential for video conferencing, streaming, and capturing images digitally, making this option the correct answer.
Conclusion
The webcam is the only option that specifically captures light and directly converts it into a digital format. All other options either serve different functions or do not engage in the conversion of light into a digital signal, confirming that D is the definitive correct choice.