Cách sử dụng
The word 'lens' refers to a piece of glass or plastic that is used in cameras, glasses, and other optical devices. It helps to focus or redirect light, allowing us to see objects clearly or capture them in a photograph. You might use the word 'lens' to talk about the lens on your glasses or the lens on your camera. It's also used in science and engineering to refer to other types of lenses that have different shapes and functions.