Question

Suppose you wanted special glasses designed to let you see underwater without a face mask. Should the glasses use a converging or diverging lens? Explain.

Short answer

Glasses with converging lenses

Step-by-step solution

Step `1.Given Information and concept

A normal mask has a flat plastic, so that light hitting your eyes comes from air. Since the n for water is near that of the eye, there is no convergence created by the cornea. To fix this, you would need a converging lens whose focal length in water is about the focal length of your cornea in air.

Step 2. Simplify

Indices of refraction of cornea and water are similar, hence light rays will converge less. Glasses with converging lenses will be suitable to look in underwater situation.

So, the answer is \text{\underline{Glasses with converging lenses. Glasses with converging lenses.