Since a lens can only be held in place by its edge, the centre of a large lens will sag due to gravity, distorting the image it produces. The largest practical.

Slides:

Advertisements

Similar presentations

Early Work – Mar. 26 List five ways in which you use a mirror or a lens on a daily basis. Ch. 18 Vocab.

Advertisements

Lenses and Mirrors Mrs. Gergel. Lenses and Mirrors Mrs. Gergel.

What do you know about Mirrors? 1.We see objects because _____. a. light is reflected off of objects b. objects generate their own light c. both A and.

Ch. 18 Mirrors and Lenses Milbank High School. Sec Mirrors Objectives –Explain how concave, convex, and plane mirrors form images. –Locate images.

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.

 If an object is beyond 2F, the image from a converging lens will be inverted, real, and smaller, and will always lie somewhere between F and 2F on the.

Reflecting Telescopes Astrophysics Lesson 3. Homework Collect last homework – feedback on Friday. Past Paper Question for this Friday.

Chapter 11 Review Mirrors & Lenses. What is an angle of incidence? 2 The angle between an incident ray and the normal of an optical device. Category:

Fig (a) An uncorrected myopic (nearsighted) eye. (b) A negative (diverging) lens spreads the rays so that the myopic eye can focus the image on.

Physics 52 - Heat and Optics Dr. Joseph F. Becker Physics Department San Jose State University © 2005 J. F. Becker San Jose State University Physics 52.

Grade 8 Science Unit 2: Optics Chapter 6: Lenses refract light to form images.

IV. Optics Nature of light. Spectrum of electromagnetic waves.

Optical Systems Make use of Mirrors and Lenses!.  Sir Isaac Newton – developed the particle model of light- thought that light was made of tiny particles.

Chapter 17 Optics 17.1 Reflection and Refraction

Visual Angle How large an object appears, and how much detail we can see on it, depends on the size of the image it makes on the retina. This, in turns,

A. can be focused on a screen. B. can be projected on a wall.

Refraction and Lenses Light bends--so you can see better!

Chapter 18 Mirrors and Lenses Lenses A. Types of Lenses A. Types of Lenses B. Convex Lenses B. Convex Lenses C. Concave Lenses C. Concave Lenses.

(c) McGraw Hill Ryerson Extending Human Vision Microscopes A compound light microscope uses two convex lenses to magnify small, close objects.

Mirrors and Lenses Chapter 14.

Chapter 20 Mirrors and Lenses. Objectives 20.1 Explain how an image is formed in three types of mirrors 20.1 Identify examples and uses of plane, concave,

Geometric Optics. An object inside the focus casts a virtual image that is only focused by the eye.

Science 8 – Unit C: Light and Optical Systems Topic 5: Extending Human Vision.

(c) McGraw Hill Ryerson Extending Human Vision Microscopes A compound light microscope uses two convex lenses to magnify small, close objects.

Extending Human Vision. Microscopes (c) McGraw Hill Ryerson 2007  A compound light microscope uses two convex lenses to magnify small, close objects.

1. How is the index of refraction calculated? How is light refracted as it speeds up? How is light refracted as it slows down? Index of refraction = speed.

SNC2D Chapter 13. Lenses A transparent object used to change the path of light Examples: Human eye Eye glasses Camera Microscope Telescope Reading stones.

12.1 Characteristics of Lenses. Today we will learn about...  the different types of lenses, the characteristics of the image formed by each of those.

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

Tools of Modern Cosmology Friday, October 3 Next Planetarium Shows: Tues 7 pm, Wed 7 pm.

Mirrors and Lenses Chapter 23, Section 1. Mirror and Lens Assignment Use p. 668 – 673 in your text Draw the following pictures ◦ Plane mirror ◦ Concave.

Notes 2-5 OPTICAL TOOLS. Cameras: How do they work? Light from object travels through one or more convex lenses Lens focuses light Puts an image on film.

Chapter 18-2 Lenses.

©JParkinson1TELESCOPES INCREASE THE ANGLE THAT AN OBJECT SUBTENDS AT THE EYE REFRACTORS REFLECTORS THE OBJECTIVE IS A LENS THE OBJECTIVE IS A MIRROR NEWTONIAN.

A Basic Refractor Telescope The size of the telescope is the diameter of the light-collecting lens.

GALILEAN TELESCOPE How to Build It. Structure: TWO LENSES OBJECTIVE just outside The object being viewed is placed just outside the focal length of the.

Refracting Telescopes vs Reflecting Telescopes. Essential Questions- You should be able to answer these questions by the end of the PowerPoint.  What.

November 6th, 2015 Katie Hellier IRIS Science Academy

Physics 203/204 4: Geometric Optics Images formed by refraction Lens Makers Equation Thin lenses Combination of thin lenses Aberration Optical Instruments.

{ Light and Lenses Concave and Convex Lenses. A lens is a transparent object with at least one curved side that causes light to bend. The amount of bending.

+. + Lenses and Mirrors Mrs. Gergel + Refraction of light When light rays enter a new medium at an angle the change in speed causes them to bend, or.

Chapter 18 Mirrors and Lenses. Objectives 18.1 Explain how concave, convex, and plane mirrors form images 18.1 Locate images using ray diagrams, and calculate.

Refraction & Lenses Sections 11.7 and 11.8.

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

6.2 Extending Human Vision.  Distance between the lens and the screen must be correct to have a clear image = focussing   Compound light microscope.

19.3 Optical Instruments

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

OPTICAL DEVICES The earliest optical devices The earliest optical devices Everyday optical devices Everyday optical devices Telescopes… Refractive and.

 Imagine a clear evening when a full moon is just starting to rise. Even though the Moon might seem large and close, it is still too far away for you.

6.2 Extending Human Vision

6.2 Extending Human Vision

Converging Lenses Converging lenses change the direction of light through refraction so that the light rays all meet (converge) on a single focal point.

Lenses and Mirrors Mrs. Gergel. Lenses and Mirrors Mrs. Gergel.

IV. Optics Nature of light. Spectrum of electromagnetic waves.

6.2 Extending Human Vision

17.3 Optical Systems 1.

12.1 Characteristics of Lenses

17.2 Mirrors, Lenses, and Images

Lesson P4 Part 2 ~ Lenses & Refraction

Lenses Lesson 10.

Lesson 21 - Optical Devices

Mirrors and Lenses A mirror is a sheet of glass that has a smooth, silver-colored coating on one side. When light passes through the glass, the coating.

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.

6.2 Extending Human Vision

Lesson P4 Part 2 ~ Lenses & Refraction

Presentation transcript:

Since a lens can only be held in place by its edge, the centre of a large lens will sag due to gravity, distorting the image it produces. The largest practical lens size in a refracting telescope is around 1 meter.

Reflecting Telescope concave mirror plane mirror Most large, modern telescopes are reflecting telescopes because the concave mirror can be made larger.

In the Hubble telescope, the concave mirror is 2.4 m in diameter. nebula

Mirror systems also don't face the color-correction problems that lens systems do. All colours of light reflect from mirrors the same way, but they refract through lenses by varying amounts. chromatic aberration

Microscopes are similar to refracting telescopes. They produce an inverted, virtual image that that is larger than the object.

Binoculars are two refracting telescopes that are attached so that both eyes see the same image. Prisms in the binoculars laterally & vertically invert the image so you see the object in its actual orientation. This prism inverts the image side to side. This prism inverts the image up & down. total internal reflection * * The critical angle between glass & air is less than 45 o.