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 a lens and convert it into a digital signal, allowing for video transmission and recording. This process involves converting the analog light data into a format that can be processed by computers.
A) Inverter
An inverter is an electronic device that converts direct current (DC) into alternating current (AC). It does not have the capability to convert light into a digital signal, which is essential for video processing and transmission.
B) OLED
An OLED (Organic Light Emitting Diode) is a display technology that emits light when an electric current passes through it. While it produces light for visual output, it does not convert light into a digital signal, which is not its intended function.
C) Digitizer
A digitizer is a device that converts analog signals into digital form but typically refers to processes involving physical inputs, like touchscreens or scanners. It does not specifically convert light into a digital signal in the context of image or video capture.
D) Webcam
A webcam captures light using its lens and sensor, converting this light into a digital signal that can be used for video conferencing, streaming, or recording. This function is central to the operation of a webcam, making it the correct answer.
Conclusion
The webcam is definitively the correct answer as it fulfills the requirement of converting light into a digital signal, a process critical for video applications. In contrast, the other options either serve different functions or do not have the capability to perform this conversion effectively.