Question

You can’t see clearly underwater with the naked eye, but you can if you wear a face mask or goggles (with air between your eyes and the mask or goggles). Why is there a difference? Could you instead wear eyeglasses (with water between your eyes and the eyeglasses) in order to see underwater? If so, should the lenses be converging or diverging? Explain.

Short answer

Both sides wobble then it is a convex lens.

Step-by-step solution

About Convex lens.

You will want to pick the convex lenses. A convex lens is curved on both sides. Therefore, places each lens on a flat surface and see if it wobbles on both the front and back surface. If both sides wobble then it is a convex lens.