Pg. 506 - 511.  The Eyeball The Eyeball  Iris: coloured part of the eye that opens and closes to let in more or less light. In the centre you find.

Slides:

Advertisements

Similar presentations

THE HUMAN EYE Gives the sense of sight. Allows us to learn more

Advertisements

Light Notes 3 THE EYE.

Review – for marks! 1) What is the difference between a mirror an a lens? 2) Why do you think we have a lens in our eye instead of a mirror?

The Eye and Sight Contrast ways in which light rays are bend by concave and convex lenses. Describe how a prism forms a visible spectrum Explain why different.

Lenses  Lenses display focusing properties because of refraction.  A convex lens will focus a parallel beam of light to a certain point.  A concave.

Topic 4: Lenses and Vision

Thin Lens Equation Distances of virtual images are negative & distances of real images are positive. Heights are positive if upright (above P.A.) and negative.

 Cornea: ◦ Tissue that forms a transparent, curved structure in front of the eye ◦ Refracts light before it enters the eye  Retina: ◦ A layer of cells.

 Get out notes and practice from yesterday  Pick up ruler and finish practice from yesterday.

The Human Visual System The Eye. Anatomy of the Human Eye Cornea Pupil Iris Sclera Retina Optic Nerve Lens.

How Do Your Eyes Help You See?

12.3 Lens Technologies and the Human Eye

The Human Eye. Refractive index of lens different for each wavelength (colour) Cool colours (blues) appear closer; warm colours (reds) further away Agree?

L 33 Light and Optics [3] Measurements of the speed of light  The bending of light – refraction  Total internal reflection  Dispersion Dispersion 

Physics. PHS 5041 Optics Lenses Lenses are transparent objects with at least one curved surface. Lenses can be: _Convex or converging (***thickest at.

Lesson 3 Our eyes work in a way that is similar to a camera. Like the click of a camera lens, in the blink of an eye images are formed in the process of.

Lesson 3 Our eyes work in a way that is similar to a camera. Like the click of a camera lens, in the blink of an eye images are formed in the process.

The Human Eye Comparing human eye to camera Hyperopia, Presbyopia & Myopia.

18.4 Seeing Light Pg

The Cornea Light enters the eye through the cornea

Human Vision. The pupil is the dark transparent region in the centre of the eye where light enters. The iris is the coloured circle of muscle surrounding.

(c) McGraw Hill Ryerson Human Vision The pupil is the dark transparent region in the centre of the eye where light enters. The iris is the coloured.

The Plan… 1 May 2013 (c) McGraw Hill Ryerson 2007 Start Unit 6 – Human Vision  6.1 Human Vision  PowerPoint Presentation & Worksheet  This is homework…

The Eye. Cross-section of an eye muscle optic nerve aqueous humour lens pupil iris cornea ciliary muscle vitreous humour blind spot retina sclera.

The Eye and Sight Describe the relationship between the structure of the eye and sight Contrast ways in which light rays are bent by concave and convex.

The Human Eye 13.6 Optics THE HUMAN EYE: How Images Are Formed The human eye gathers light from objects. In a healthy eye, a smaller, inverted, real.

The Human Eye. In many ways, the human eye is similar to a camera. Light enters through an opening, is focused through a lens, passes through a light-tight.

Chapter 2 Section 4 Seeing Light.

Human Perception of Light

(c) McGraw Hill Ryerson Human Vision The pupil is the dark transparent region in the centre of the eye where light enters. The iris is the coloured.

L 33 Light and Optics [3] images formed by mirrors

Chapter 12 Review Light and Vision. Category: The Eye Give the name and function of the eye part indicated by #3 (the thin layer between #1 and #2). Choroid.

The Eye and Sight Chapter 12. Vision begins when light rays are reflected off an object and enter the eyes through the cornea, the transparent outer covering.

Human Vision Outcome C4 – Explain how human vision works.

Seeing light When light from an object enters your eye, the eye sends a signal to your brain and you see the object. When light from an object enters your.

Lenses and Our Eyes.

Construction of Human Eye –iris, pupil, cornea, aqueous humour, lens, ciliary muscle, vitreous humour, retina Focusing –seeing near object ( near point.

Structure of Human Eye: –Eye Muscles, Optic nerve, sclerotic coat –Cornea, iris, pupil,, lens, retina, blind spot –aqueous humour, vitreous humour, ciliary.

Convex and Concave Lenses

Minds-on. The Human Eye The Eye vs. the Camera The EyeThe Camera Opens and closes to adjust the amount of light that enters The IrisThe diaphragm.

Lens Applications.

{ The Human Eye. Parts of the Eye Iris Pupil Cornea Lens Optic nerve Retina.

Lesson 3 To understand the effect that convex and concave lenses have on light. 2. To appreciate real world applications of concave and convex lenses.

Label the Eye – use book pg. 618 Structure & Function: use book pgs Cornea: clear tissue that covers front of eye. Pupil: opening through.

Seeing Light Chapter 2 Section 4. Vocabulary Cornea – the clear tissue that covers the front of the eye Cornea – the clear tissue that covers the front.

The eye Image formation Accommodation Focusing on near objects Focusing on distant objects Eye defects: short sight, long sight, colour blindness.

Chapter 13: Mirrors and Lenses Section 1 : Mirrors Section 2: Lenses Section 3: Optical Instruments.

6.1 Human Vision.  Light enters the eye through the pupil  The iris (the coloured part of the eye) controls the amount of light entering the eye  In.

Topic 4: Lenses & Vision. A lens is a curved piece of transparent material (glass/plastic). When light rays pass through it, the light is refracted, causing.

The iris is the coloured circle of muscle surrounding the pupil.

Unit 3 Lesson 4 Light Waves and Sight

The Human Eye Extension.

The iris is the coloured circle of muscle surrounding the pupil.

The iris is the coloured circle of muscle surrounding the pupil.

The iris is the coloured circle of muscle surrounding the pupil.

Refraction of Light When light rays enter a medium at an angle, the change in speed causes the rays to bend, or change direction Some mediums cause light.

Chapter 12 Review Light and Vision.

Goal 8- The Eye Understand how we see . Goal 8- The Eye Understand how we see

Week 9: Seeing Light CHAPTER 4, SECTION 4 Page 125 – 128.

Human Eye Structure of Human Eye: Focusing Eye defects

Title: The Human Eye LO: 1. Identify the parts of the human eye and state their functions. 3/4/2019 STARTER: What do these have in common?

Unit 3 Lesson 4 Light Waves and Sight

Entering The Eye Here We Go. . ..

Presentation transcript:

pg

 The Eyeball The Eyeball

 Iris: coloured part of the eye that opens and closes to let in more or less light. In the centre you find the pupil  Pupil: opening where light enters the eye  Cornea: Transparent bulge on top of the pupil

 Lens: Clear part behind the iris ◦ NOTE: Both the cornea & lens focus light & cause it to converge on the back of the eye.  Retina: Inner lining of eye that is made of light-sensitive cells, called rods and cones. These cells receive light rays, process them & send electric signals to the optic nerve

 Optic Nerve: The nerve at the back of the eye that is attached to the retina. It transmits the electrical impulses from the retina to the brain ◦ Since there are no light sensitive cells here, it creates a blind spot but each eye compensates for the other

 Light entering our eyes is refracted  The lens acts like a converging lens that produces a smaller, real, inverted image on the retina.  Electrical impulses travel through the optic nerve to the brain  Brain flips the inverted image so what we see is upright

 Accommodation is the changing of shape of the lens by ciliary muscles to allow a sharp focused image to form on the retina  By changing the eye’s shape, the focal length changes, allowing us to focus on distant and nearby objects

 Accommodation does not always work well. This results in an inability to focus on objects and thus producing blurred vision

 Inability to focus light from nearby objects (can see distant objects)  Light is focused behind the retina  Caused by a thin cornea; or an eyeball that is too short

 Corrected using converging contact lenses or eye glasses to help refract the light  A modified form of the converging lens, called a positive meniscus is used because it is thinner & more visually appealing than a basic converging lens

 Form of far-sightedness caused by a loss of accommodation as a person ages  Eye loses its elasticity as we grow older  Corrected using glasses with converging lenses

 Inability of the eye to focus light from distant objects (can see nearby objects)  Light is focused in front of the retina  A modified form of the diverging lens, called a negative meniscus, is used

 blurred or distorted vision  caused by an incorrectly shaped cornea  corrective lenses or laser eye surgery can be used to correct astigmatism

 Read pg  Do #5, 7, 8 on pg. 511  Study for your Physics Unit Test (Chapters 10, 11, 12)