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Transcript
Tuesday, November Entry Task Take the next couple of minutes to study for your test th 13 Schedule: • Chapter 17 Test Objective: •I can be assessed on important information about the electromagnetic spectrum You will do the following today: Homework 1. Take the test • Chapter 18 introduction 2. Turn in the test 3. Get a chapter 18 intro and • Read/RSG 18.1 a 18.1 RSG 4. Work on these, they are due tomorrow Wednesday, November 14th Entry Task Write down the following and then name the term described by each. 1. 2. 3. 4. Schedule: • 18.2 Read • 18.2 Notes Packet Objective: • I can understand that How a light wave bends when lenses for images by it enters a new medium at an refracting light angle Homework: How a light wave bounces • Finish note packet back when it hits a barrier The type of wave visible Please have on desk: light is • Work from yesterday will What mirrors do to light be checked off tomorrow waves to form images Thursday, November 15th Entry Task Schedule: • Mirrors and Lenses Notes Write down each definition and match it with the correct term. 1. A picture of an object formed by light rays 2. The point where parallel light rays striking a concave mirror meet 3. A surface that curves out like the back of a spoon. Objective: I can understand that mirrors for images by reflecting light and that lenses form images by refracting light Terms: concave, convex, focal point, optics, image Homework • 18.2 RSG Please Have on Desk • Chapter 18 Introduction • 18.1 RSG • 18.2 Notes packet Plane Mirrors 1. Look at the shiny side of the foil How clear is the image produced by the mirror (Use a 0-4 scale with 4 being perfectly clear and 0 being no image visible)? Why is this the case. 2. Look at the dull side of the foil How clear is the image produced by the mirror (Use a 0-4 scale with 4 being perfectly clear and 0 being no image visible)? Why is this the case. 3. Lightly crumple the foil and then flatten it again How clear is the image produced by the mirror (Use a 0-4 scale with 4 being perfectly clear and 0 being no image visible)? Why is this the case. Reflection Plane Mirrors normal angle of incidence angle of reflection 60° 60° REGULAR REFLECTION Diffuse Reflection Concave Mirror Convex Mirror Lenses form images by refracting light A medium can refract light • Refract: the bending of a wave as it crosses the boundary between two mediums at an angle other than 90 degrees. – Mediums: air lens air – Occurs because one side of the light wave reaches the new medium (lens) slightly before the other side does. – That side changes speed, while the other continues at regular speed, causing it to turn. Refraction of light • Direction in which a light wave turns depends on whether the new medium slows the wave down or allows it to travel faster. – Denser medium-slow down – Thinner medium-speed up • The normal- imaginary line perpendicular to the new surface that helps describe refraction – If the medium slows the wave, the wave will turn toward the normal. – If the medium lets the wave speed up, the wave will turn away from the normal. Refraction and Rainbows • Rainbows are cause by refraction and reflection of light through spherical water drops which act as prisms. – Like a prism, water drops separate the wavelengths of sunlight to produce a spectrum. – Unlike a prism, only one color reaches your eye from each drop. • Red appears at the top of a rainbow because it is coming from higher drops • Violet comes from lower drops Shape determines how lenses form images • Flat mediums- produce a clear image on other side • A lens is a clear optical tool that refracts light- non flat mediums. – Different lenses refract light in different ways – These different images formed are useful for a variety of purposes • Types of lenses: convex and concave Convex Lens • Curved outward • Parallel light rays passing through a convex lens are refracted inward. – They meet at a focal point on the other side of the lens – Rays refract twice: when entering the new medium and when leaving the new medium. – Rays on the outer part of the lens are refracted the most – Rays on the principal axis-the line joining the center of the two curved lenses- will go straight through and not refract. focal point principal axis Concave Lens Principle Axis • The lens is curved inward. • Parallel light rays that pass through a concave lens are refracted outward. – Rays do not ever meet. – Rays refract twice: when entering the new medium and when leaving the new medium. – Rays on the outer part of the lens are refracted the most – Rays on the principal axis-the line joining the center of the two curved lenses- will go straight through and not refract. Images formed by lenses • Type of image depends on – Lens type – For convex lenses: the distance between the lens and the object. • Convex lens: Distance from lens is measured in focal length- the distance from the center of the lens to the lens’s focal point. How Convex Lenses Form Images • Look at the 3 steps below to see how an image is formed by a convex lens. Step 1 is repeated from the previous slide. Convex Lenses Bigger? Smaller? Flip-Flop? • If the object is more than two focal lengths away, the image will be upside down and smaller. • If the object is between 1 and 2 focal lengths away the image will be upside down and larger. • If an object is less than one focal length away it will appear right side up and larger. Concave Lenses • Always right side up and smaller than normal appearance. • Distance between lens and object does not make a difference. Friday, November Entry Task Do the following using your own words 1. Define Focal Point 2. Define Focal Length 3. Define Lens th 16 Schedule: • Looking at Mirrors and Lenses Lab Objective: •I can understand that lenses form images by refracting light Homework • Read/RSG 18.3 Please have on desk: • 18.2 RSG