Final answer:
Putting a lens at the air bubble can create a distorted image, block the light, and cause damage to the lens.
Step-by-step explanation:
In general, you should not put a lens at the air bubble because it will create a distorted image. When light passes through a lens, it can cause the path of the light rays to be bent and refracted. However, when there is an air bubble in the lens, it can disrupt the path of the light rays and cause the image to appear distorted.
Furthermore, the presence of an air bubble can also block the light. Light needs to pass through the lens in order to form an image, so if there is an air bubble obstructing the path of the light, it can prevent the formation of a clear image.
Lastly, putting a lens at the air bubble can also cause damage to the lens. Lenses are often delicate and fragile, and placing them at the air bubble can lead to physical damage such as scratches, cracks, or in worst cases, complete breakage.