Shooting small objects at close range is called macro photography in photography. For this reason, a close-up adapter is often installed behind the camera lens. This is done for ().

Correct answer:

B. Increase the image distance

The distance from the lens to the subject is the object distance.

The distance from the lens to the photosensitive element is the image distance.

When taking close-up shots, the object distance is small, so the image distance increases. By adding a close-up adapter, you can increase the image distance so you can focus on closer objects.

C and D in the answers are interference answers and are meaningless.