Aamc 5 q52

[nr6unhH]

---

Members don't see this ad.

Q. In a nearsighted individual, the image of a distant object is focused:

A. in front of the retina, requiring divergent lens correction
B. in front of the retina, requiring convergent lens correction
C. behind the retina, requiring divergent lens correction
D. behind the retina, requiring convergent lens correction

Answer: A

* A nearsighted (myopic) person can focus on nearby objects but cannot clearly see objects far away. The nearsighted eye has a focal length that is shorter than it should be, so the rays from a distant object form a sharp image in front of the retina. This condition is corrected by glasses with a divergent lenses.

Can someone explain this for me..? I really dont get optics/lenses. So if I were to just memorize the answers, for farsighted individual: would the answer be: behind the retina, requiring convergent lens correction?

thanks!

 

[mcatbeast]

Q. In a nearsighted individual, the image of a distant object is focused:

A. in front of the retina, requiring divergent lens correction
B. in front of the retina, requiring convergent lens correction
C. behind the retina, requiring divergent lens correction
D. behind the retina, requiring convergent lens correction

Answer: A

* A nearsighted (myopic) person can focus on nearby objects but cannot clearly see objects far away. The nearsighted eye has a focal length that is shorter than it should be, so the rays from a distant object form a sharp image in front of the retina. This condition is corrected by glasses with a divergent lenses.

Can someone explain this for me..? I really dont get optics/lenses. So if I were to just memorize the answers, for farsighted individual: would the answer be: behind the retina, requiring convergent lens correction?

thanks!

think about it logically, basically if nearsighted you cant see far away things, this means that the light rays coming thorugh the lens of the eye converge before reaching the retina. now to correct the problem you would want to make the rays reach the retina and this would be done by using a diverging lens to diverge the rays. the divergeing allows it to reach the retina and see far objects. on the flip is you are far sighted the rays converge past the retina so to correct that you must use a converging lens to converge the rays closer to the retinal surface.

lastly you could just memorize:
near sighted, rays converge in fornt of retina= correct with diverging lens
far sighted, rays converge past retina= correct with converging lens