Chapter 25, Problem 5Q

Will a nearsighted person who wears corrective lenses in her glasses be able to see clearly underwater when wearing those glasses? Use a diagram to show why or why not.

To determine

If a nearsighted can see clearly underwater with the same corrective lens glasses used in air. And explain why or why not with the help of diagram.

Answer to Problem 5Q

Solution:

No, a nearsighted person will not be able to see clearly if she wears her corrective lenses underwater.

Explanation of Solution

No, a nearsighted person will not be able to see clearly if she wears her corrective lenses underwater.A nearsighted person has a far point that is closer than infinity and wears corrective lenses to bring the image of a faraway object to their far point so she can see it clearly.

In the above diagrams, the object is at infinity. In air, the image is at the (relatively close)far point. When the person sees underwater with the same corrective lens, the glass will not bend the light as much as it bends it in air since the index of refraction of glass is closer to that of water than the index is closer to that ofair.

That is as shown in the diagram the image formed will be farther away from the far point. The image of the far object will now be at a position that is beyond the person’s far point. The image seen will be out of focus.