Thrash It Out Online

Eye Floaters And Flashes

Menu
  • Curation Policy
Menu
Lenses and the Human Eye

Lenses and the Human Eye

Posted on August 11, 2019 by Jason Robles


This is a lens and this is a lens and this is a lens. In today’s video you will learn the basics of lenses and the
human eye. To begin with there are two types of lenses convex and concave. Convex lenses cause light beams to
converge on a point the focal point. In fact you can use this focal point to start
fires. Even the word focus means fire in Latin. Concave lenses cause light beams to
diverge and don’t have a focal point. Well, they
do, but its imaginary. You can trace these
rays back to where they seem to be coming from and that’s the imaginary focal point. A
convex lens can also be used as a magnifying glass. Hey, E pluribus unum. But a concave
lens has a magnification have less than one caussing objects to always look smaller. In fact another way to measure for the focal
distance of a concave lens is to look for the point at which the
image is half the original object’s size. To quickly find the focal distance of a
convex lens you want to look for the point at which the world flips from being upside down to right
side up. Find the point the nonsense point at which
no light is focused and no image is formed. Perhaps most important
use a convex lens is its ability to project images. Take a look at this. The
problem is these images always appear upside dow. Hey look Royce Hall. The same thing happens with
the human eye. We’re gonna be looking at the skeleton
using this human eye model. And was projected on the back you’ll see
what happens. But I have to turn off the lights. Don’t get scared now When light enters the eye the convex
lens focuses it on the retina in the back of the eye.
This image is of course upside down. You probably have long since
forgotten those blurry few months during infancy during which you train your mind
to see property. The human I actually contains two lenses one on the outside and one on the inside.
The one on the outside is called the cornea and you can feel your own cornea by
closing an eyelid and putting two fingers over in looking left and right. That little bubble you feel moving
around is the cornea, the outside lens. The lens on the inside
of the eye is called simply the lens and it changes
shape based on your focus whether you’re
focusing on close objects or faraway objects. And this opening
here is called the pupil. It can constrict to let in less light on a bright day. But what do you think
this will do? The cat eye pupil. How do you think that
will affect an image? Here the image of a light bulb is being
produced on the retina of this human eye model. When I insert the
cat’s eye pupil the effect is only two dim the image.
It does not destroy it. You see just because I blocked some the light
that’s going through doesn’t mean that I destroy the image. On
the contrary the same reason lights still make it
through to form the same image in the same place. Take a look at this
situation. Here the eye is unable to focus light
from near objects. We say it’s far sided. An inserted lens
of the right focal length corrects this, and the blurry image is
made clear.

7 thoughts on “Lenses and the Human Eye”

  1. Meghana Anil says:
    October 26, 2012 at 9:14 am

    WOW. Awesome. That was soo much better than the usual class lecture…
    It was fun ^_^
    Thanks

    Reply
  2. Ramana Balachandhran says:
    June 25, 2015 at 7:08 am

    This video really helped a lot in making my understanding concrete.
    Thanks a lot!! 🙂
    -Ramana

    Reply
  3. Harry Singh says:
    June 1, 2018 at 12:42 pm

    Well done…keep it up

    Reply
  4. Raju Dogra says:
    October 7, 2018 at 5:24 am

    Wow!! I understood the concept clearly thank you so much for uploading this video……

    Reply
  5. kuldeep singh says:
    December 22, 2018 at 3:58 am

    How you made it

    Reply
  6. 12 rathore Ravinder says:
    January 31, 2019 at 7:05 am

    explain how to make it

    Reply
  7. 12 rathore Ravinder says:
    January 31, 2019 at 7:05 am

    at home

    Reply

Leave a Reply Cancel reply

Your email address will not be published. Required fields are marked *

Recent Posts

  • Mark Cuban on Artificial Intelligence | Interview | Real Vision™
  • Glaucoma Symptoms & Treatments : Glaucoma Prevention
  • 16 Multiple Sclerosis Symptoms Early Warning Signs
  • Aurawave Perfect T.E.N.S. Pain Relief by Tony Little
  • How To Get Rid Of Pain W/Unique Techniques
  • The Daily Moth 12-5-19
  • Sign1News 12.8.19 – News for the Deaf community powered by CNN in American Sign Language (ASL).
  • Treating a Crossed Eye without Surgery (15 Sec) | Wow Vision Therapy
  • A prosecutor’s vision for a better justice system | Adam Foss
  • Wedgie Hangman (GAME)

Recent Comments

  • Nicole Woodward on Wedgie Hangman (GAME)
  • Mikey Way's Unicorn on Panic! At The Disco – Into the Unknown (From “Frozen 2”)
  • It’s Mel on Panic! At The Disco – Into the Unknown (From “Frozen 2”)
  • Karina Loves Saying UwU on Panic! At The Disco – Into the Unknown (From “Frozen 2”)
  • azhar haris on Panic! At The Disco – Into the Unknown (From “Frozen 2”)

Tags

and animation audiology can cure deaf doctor ear education eye eye care eye doctor eyes for funny glaucoma hard-of-hearing health Health (Industry) hearing hearing aid hearing aids Hearing loss home remedies how to like medical medicine News nose ophthalmology pain science surgery symptoms that the this treatment video vision was you your yt:cc=on
©2019 Thrash It Out Online | Built using WordPress and Responsive Blogily theme by Superb