One day, Xiao Ming, a photographer, went out to take pictures and accidentally splashed a small mud spot on the lens. What do you think of the photos he took?

It won't have much impact, but the photos will be a little dim and gloomy.

Because the lens of a camera is like a convex lens, if a small mud spot is splashed, only that light can't enter, and the rest can still enter. The real image of the object can still be gathered on the screen (you can draw it yourself), but because the light entering is less than before, the photo effect is a little gray. But the impact is not great.

No matter how big the mud spot is, it can be imaged as long as it does not block the convex lens, but the larger the stain area, the less clear the image is.