Welcome Guest Search | Active Topics |

Tag as favorite
Lenses - Practice Set 3, Q3
Options
Previous Topic Next Topic
Matviy_5556
#1 Posted : Tuesday, June 09, 2020 11:43:58 AM
Rank: Newbie

Groups: Registered
Joined: 5/5/2020
Posts: 0

Thanks: 0 times
Was thanked: 0 time(s) in 0 post(s)
With myopia, a person cannot see things far away because the eyes focus TOO MUCH light making the focal point in front of the retina. Shouldn't corrective lenses then increase the focal length so that the image is focused further behind and ON the retina?

Is focusing TOO much light, and therefore creating an image in front of the retina, not synonymous with too much power? This is why I thought a decrease in power is needed to correct for myopia, so the focal length can be increased. This is contrary to correct answer choice D.
Back to top
Report? | Edit by user
INSTR_Amira_87
#2 Posted : Wednesday, June 10, 2020 3:03:04 PM
Rank: Newbie

Groups: Registered
Joined: 6/13/2019
Posts: 0

Thanks: 0 times
Was thanked: 0 time(s) in 0 post(s)
Hi! I'm not sure which question you are referring to, but your initial reasoning is correct in that myopic eyes focus light in front of the retina. However, power is relative to a lens: a powerful converging lens will focus light closer to the lens and a powerful diverging lens will focus light far away from the lens. Someone who is *very* myopic will need a more powerful diverging lens to correct this (ex: -3 diopters vs -6 diopters). Hope this clears things up!
Back to top
Report?
Users browsing this topic
Guest (3)
Tag as favorite
You cannot post new topics in this forum.
You cannot reply to topics in this forum.
You cannot delete your posts in this forum.
You cannot edit your posts in this forum.
You cannot create polls in this forum.
You cannot vote in polls in this forum.

Clean Slate theme by Jaben Cargman (Tiny Gecko)
Powered by YAF | YAF © 2003-2009, Yet Another Forum.NET
This page was generated in 0.084 seconds.