The Professional Development Service for Teachers is funded by the Department of Education and Science under the National Development Plan By Mark Jordan.

Slides:

Advertisements

Similar presentations

Learning Outcome Draw a ray diagram to find the position, nature and size of the image produced by a concave and convex mirrors.

Advertisements

Mirror and Lens by Rifki Irawan. a surface, such as polished metal or glass coated with a metal film, that reflects light without diffusion and produces.

Created by Stephanie Ingle Kingwood High School

Real or Virtual? Real images A real image is one which can be produced on a screen and is formed by rays that converge. Imaginary images A virtual image.

Convex and Concave Lenses

L 31 Light and Optics-3 Images formed by mirrors

Physics 1161 – Lecture 23 Lenses

Flat Lens (Window) n1n1 n2n2 Incident ray is displaced, but its direction is not changed. tt 11 11 If  1 is not large, and if t is small, the.

Light and Optics 4.1 Mirrors form images by reflecting light. 4.2

Image Formation 2 Thin Lens Multi lens/mirror system

Thin Lenses Zahra Pirvali University Senior College Dr Shahraam Afshar University of Adelaide Centre of Expertise in Photonics.

3.6: Mirrors & Lenses 12/15/14. Part 1: Mirrors A.Light is necessary for eyes to see 1.Light waves spread in all directions from a light. 2.The brain.

Types of Lenses If you have ever used a microscope, telescope, binoculars, or a camera, you have worked with one or more lenses. A lens is a curved transparent.

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

LENS any transparent object having two nonparallel curved surfaces or one plane surface and one curved surface Converging Lenses - thicker in middle than.

Optics: Lenses & Mirrors. Thin Lenses Thin Lenses: Any device which concentrates or disperses light. Types of Lenses:  Converging Lens: Parallel rays.

Ray Diagrams Notes.

Curved Mirrors. Two types of curved mirrors 1. Concave mirrors – inwardly curved inner surface that converges incoming light rays. 2. Convex Mirrors –

Geometric Optics Conceptual MC Questions. If the image distance is positive, the image formed is a (A) real image. (B) virtual image.

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

Refraction (bending light) Refraction is when light bends as it passes from one medium into another. When light traveling through air passes into the glass.

Physics 1161 – Prelecture 23 Converging & Diverging Lenses.

Convex lens Thicker central part P.66 Concave lens Thinner central part P.66.

Optics Can you believe what you see?. Optics Reflection: Light is retransmitted from or “bounces off” an object.

Curved Mirrors and Ray Diagrams SNC2D. Concave Mirrors A concave mirror is a curved mirror with the reflecting surface on the inside of the curve. The.

Refraction through a lens. we have seen people using spectacles for reading. The watchmakers use a small glass to see tiny parts. Pistol or rifle shooters.

Lenses A transparent object used to change the path of light Examples: Human eye Eye glasses Camera Microscope Telescope Reading stones used by monks,

Mirrors and Lenses Chapter 23

There are some mirrors that distort the reflected image. Cosmetic mirrors magnify things, and other mirrors make things look smaller.

Curved Lenses SNC2P – Optics. Lenses Lenses are thin pieces of glass or plastic that have at least one curved side. There are two basic types of lenses:

Chapter 35 MirrorsLenses Images. We will use geometrical optics: light propagates in straight lines until its direction is changed by reflection or refraction.

Images formed by lenses. Convex (converging) lenses, f>0.

Predicting Images in Convex and Concave Lenses. When the object is located at twice the focal length (2F)

Lenses – Application of Refraction AP Physics B. Lenses – An application of refraction There are 2 basic types of lenses A converging lens (Convex) takes.

You should be able to: Draw ray diagrams for converging and diverging lenses Use the equation 1/u+1/v =1/f for converging lenses Perform.

SEEING THROUGH A LENS.  We see the world through lenses.  Eye glasses = lenses. Contact lenses = lenses.  Magnifying glasses = lenses. Microscopes.

Its now time to see the light…..  A lens is a curved transparent material that is smooth and regularly shaped so that when light strikes it, the light.

Ray Diagrams for Lenses. Convex (Converging) Lenses There are two Focal points One in Front and one Behind Focal point is ½ way between Center of Curvature.

Copyright © 2010 McGraw-Hill Ryerson Ltd. What are lenses and what are some of their applications? Topic4.6 (Pages )

A “Visual” Review Fuss Physical Science.

Mirrors and Lenses. Mirrors and Images Key Question: How does a lens or mirror form an image?

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.

Chapter 19. Reflection The smooth surface of the lake reflects light rays so that the observer sees an inverted image of the landscape.

Spherical Mirrors – Learning Outcomes  Recognise and use key words relating to mirrors.  Centre of curvature  Focus / focal point, focal length  Pole.

Convex and Concave Lenses

Lenses Lenses _______ light and are usually used to form ________ There are two types: In practice, light is refracted at both surfaces of the lens but.

Can you list out other applications of lenses?

SEEING THROUGH A LENS.  We see the world through lenses.  Eye glasses = lenses. Contact lenses = lenses.  Magnifying glasses = lenses. Microscopes.

Lenses – Learning Outcomes

Mirrors. Types of mirror There are two types of mirror Plane (flat) Curved Concave (curves in) Convex (curves out)

PHYSICS – Total Internal Reflection and Lenses. LEARNING OBJECTIVES Core Describe the formation of an optical image by a plane mirror, and give its characteristics.

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

Seeing Things Through a Lens You See an Eye. Seeing Things Through a Lens What Does the Eye See?

What would this image look like if you were a fly?!

OPTICS Refraction in Lenses.

Lenses and Ray Diagrams

Lenses Chapter 5.

Lenses Lesson 10.

Science 8 – Mirrors and Lenses ANSWERS

LENSES A lens is defined as - A ground or molded piece of glass, plastic, or other transparent material with opposite surfaces either or both of which.

Lenses A lens is a transparent material (with at least one curved side) that causes light refracts in a predictable and useful way. Each ray is refracted.

Lenses: Day 1 -Converging Lenses

Presentation transcript:

The Professional Development Service for Teachers is funded by the Department of Education and Science under the National Development Plan By Mark Jordan © Refraction Part 2 Lenses

The Professional Development Service for Teachers is funded by the Department of Education and Science under the National Development Plan OUTLINE OF THE DAY To Be Completed by Class Teacher

List the uses of lenses Look closely at the lenses you have been given and answer questions below: o How are the lenses shaped? o How are the lenses alike/different? o Experiment with light & separate into convex/concave Place a convex lens between window and a white piece of paper. Place the lens close to the paper and then slowly move the lens towards the window. Draw a sketch of image you see. Using prior knowledge (mirrors) compare the image from the window with the image of the man’s eye above.

4 C1C1 C2C2 C1 C1 & C2 C2 are the centres of the spheres of which the surfaces of the lens form a part The line through C1 C1 & C2 C2 form the principal axis Converging Lens Principal axis

5 C1C1 C2C2 Converging lens F F A ray of light on entering the lens is refracted towards the normal and on leaving away from the normal. Since surfaces are inclined towards each other the ray is refracted towards the principal axis. Rays parallel to the principal axis converge towards a point called the principal focus F. Since light can travel equally well in both directions, there are two foci. Normal

6 F = Focal point To locate the position of an image in a convex lens we use two of the following rays of light FF 3 through the focus emerging parallel to principal axis. 1 parallel to the principal axis emerging through focus 2 striking the centre of the lens passes straight through (if lens is thin)

7 F = Focal point object Images in Convex lens vu f Image Real, inverted & diminished Image formed in convex lens when the object is placed outside twice the focal length FF

8 Image formed in convex lens when the object is placed at twice focal length F = Focal point object Image Real, inverted & same size as object Images in Convex lens vu f FF

9 Image formed in convex lens when the object is placed between f and 2f F = Focal point object Image Real, inverted & magnified vu f FF

10 Image formed in convex lens when the object is placed at the focus F = Focal point object Image at Infinity Images in Convex lens u f FF

11 Image formed in convex lens when the object is placed inside the Focus F = Focal point object Images in Convex lens u f Image Virtual, magnified & upright FF

12

13 raybox lens screen u v Experiment to find the focal length of a convex lens

14 F = Focal point 1. A ray which strikes the lens travelling parallel to principal axis is refracted as if it came from focus 2. A ray striking the centre of the lens passes straight through ( if lens is thin ) 3. A ray heading for the focus on striking the lens is refracted parallel to principal axis To locate the position of an image in a concave lens we use two of the following rays of light Convave lens FF

15 Image formed in concave lens when the object is placed in front of lens F = Focal point object Images in Concave lens Image Virtual, upright & diminished v u f FF

16 Cornea Iris Pupil Lens Optic nerve Retina Suspensory ligament

17 Accommodation is the ability of the lens in the eye to change it’s focal length so that light from close up and distant objects always fall on the retina

18 light from distant object falls short of retina light from distant object falls on retina with help of a diverging (concave) lens Short-sight defect Corrected

19 light from near object falls ‘behind’ retina Long-sight defect Corrected with help of a converging (convex) lens falls on retina light from near object

The Professional Development Service for Teachers is funded by the Department of Education and Science under the National Development Plan