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© Boardworks Ltd 2003 Reflection 3.2 (a) Reflection of light Core Describe the formation, and give the characteristics, of an optical image by a plane mirror Use the law angle of incidence = angle of reflection Supplement Perform simple constructions, measurements and calculations
© Boardworks Ltd 2003 Objectives Recall that light travels in straight lines. Draw accurate ray diagrams. Describe how we see objects. Define the words opaque and transparent. Describe the images formed in a plane mirror. Recall how the angle of incidence and angle of reflection are related for a plane mirror. Describe the differences between convex and concave mirrors.
© Boardworks Ltd 2003 Light rays A light ray is a narrow beam of light. When drawing light diagrams always….. 1. Use a ruler. 2. Add an arrow to show the direction the light ray is travelling in.
© Boardworks Ltd 2003 How does light travel? 1)Fill a clear glass trough or empty fish tank with smoke. 2)Shine rays of light through the tank and describe what you see.
© Boardworks Ltd 2003 Light travels in straight lines Your experiment shows that light travels in straight lines. What every day consequences do you think this fact has? You can not see around corners. Shadows are formed in the area behind an object where light can not reach.
© Boardworks Ltd 2003 Seeing objects How do we see an object? Do we see all objects in the same way? There are two ways we see objects….. We see some objects because they are light sources. We see some objects by reflected light.
© Boardworks Ltd 2003 Seeing objects Light sourcesObjects seen by reflected light Sun Jupiter Firefly Moon Book Light bulb
© Boardworks Ltd 2003 Light sources How do light rays from the Sun and other light sources reach our eye? They travel in a straight line directly into our eye.
© Boardworks Ltd 2003 Reflected light How do light rays from a book and other such objects reach our eye? Light from the Sun or another light source strikes the book and some of the light is reflected into our eye.
© Boardworks Ltd 2003 Opaque and transparent materials Use a textbook or other source to find out what the words opaque and transparent mean. Opaque materials do not let light though. Transparent materials do let light through.
© Boardworks Ltd 2003 Reflections There are two types of m____. F__ mirrors and c____ mirrors. Flat mirrors are known as p___ mirrors. If a mirror curves in then it is a c_____ mirror, if it curves out it is a c____ mirror. irrorslat urved lane oncave onvex
© Boardworks Ltd 2003 Plane mirrors Write out the letters of the alphabet down one side of a piece of paper, then next to the letter draw what the letter would look like as seen in a mirror. What do you predict the letter ‘L’ would look like in a mirror? What do you predict the letter ‘P’ would look like in a mirror?
© Boardworks Ltd 2003 Right and left What happens to writing in a mirror? The writing in a mirror is laterally inverted or back to front. If you are wearing a T-shirt with some writing on and wave your right hand what will your image appear like in a mirror? The writing on your T-shirt will be back to front and your image will be waving it’s left hand.
© Boardworks Ltd 2003 Rear-view mirrors Imagine you are driving along in your car…… …and then you look up and see the following in your mirror….. …with your knowledge of mirrors how must the writing be written on the vehicle?
© Boardworks Ltd 2003 Reading in Mirrors In small groups, take it in turns to read the list of words on the next slide with your back to the screen using a mirror. You can only move on to the next word when you read the first word correctly. Put your results in a table like this:
© Boardworks Ltd 2003 Words DogManBall BatBikeAnts ParkFinsPink LitterSandyShark
© Boardworks Ltd 2003 Results A)Who read the words in the quickest time? B)Plot a bar chart of you r results like: C)What was the average time taken in your group?
© Boardworks Ltd 2003 Image size and distance For a plane mirror how does the size of the image and the image distance from the mirror relate to the original object? Object Image Image size and object size are the same. The image distance is the same as the object distance from the mirror.
© Boardworks Ltd 2003 Investigating reflection Apparatus: Power pack Ray box Slit Concave mirror Protractor Ruler The ray box will get very hot, be careful when handling it.
© Boardworks Ltd 2003 Investigating reflection 1. Place the concave mirror on a piece of paper. 2. Draw a line along the front of the mirror. 3. Shine rays of light at varying angles to the normal and record the position of the incident and reflected rays 6. Measure the incident angles and the reflected angles for each ray. Record your results in a table. Incident angle i Reflected angle r Reflected ray Incident ray 4. Draw a tangent to the mirror where the ray hits. 5. Draw a normal to the mirror (at right angles to the previous line).
© Boardworks Ltd 2003 Results i/° r/° 0 30 45 70 85 0 30 45 70 85 What do you notice? Is there a pattern? Angle of incidence = Angle of reflection
© Boardworks Ltd 2003 Using plane mirrors By positioning two plane mirrors at 45° to each other at either end of a tube we can make a _________. periscope Periscopes are used in __________. submarines
© Boardworks Ltd 2003 Reflection : Curved mirrors Concave reflectors are used to focus signals from distant satellites. Convex reflectors are used to widen the field of view.
© Boardworks Ltd 2003 Which of the following is not a light source? A.The Sun B.A star C.Traffic lights D.A book
© Boardworks Ltd 2003 Which of the following is not seen by reflected light? A.Your hand B.Jupiter C.Light bulb D.The Moon
© Boardworks Ltd 2003 Which of the following is the most opaque? A.Milk B.Sea water C.Air D.Drinking water
© Boardworks Ltd 2003 What do we call the area behind an object where light can not reach? A.Transparent B.Shadow C.Opaque D.Outline
© Boardworks Ltd 2003 Which statement below is untrue for the image in a plane mirror? A.It is laterally inverted B.It is real C.It is same size as the object D.It is the same distance from the mirror as the object
© Boardworks Ltd 2003 Objectives Recall that light travels in straight lines. Draw accurate ray diagrams. Describe how we see objects. Define the words opaque and transparent. Describe the images formed in a plane mirror. Recall how the angle of incidence and angle of reflection are related for a plane mirror.
© Boardworks Ltd 2003 = What I should know: The law of reflection: the angle = the angle of incidence of reflection A periscope uses 2 mirrors, set at 45° to the horizontal. The image in a plane mirror is: as far behind the mirror as the object is in front, the line joining the image to the object is at 90° to the mirror, a virtual image (no light rays go through it), the same size as the object, laterally inverted. What I should be able to do: Carry out an experiment to test the law of reflection. Draw a diagram of a periscope and explain how it works. Describe an experiment to find out the position of an image in a plane mirror. Understand a ray diagram which shows 2 light rays reflected off a mirror and into an eye.
© Boardworks Ltd 2003 KS4 Waves : Reflection. © Boardworks Ltd 2003 Objectives Recall that light travels in straight lines. Draw accurate ray diagrams.
© Boardworks Ltd of 20 © Boardworks Ltd of 27 KS4 Physics Reflection.
Reflection. Ray diagrams Beams of light travel in straight lines. We can see this when we look beams of light such as search lights, laser beams, car.
© Boardworks Ltd 2003 Reflected light How do light rays from a book and other such (non-luminous) objects reach our eye? Light from the lamp or another.
IGCSE Physics Light and images. Lesson 6 – Light and images Aims: To recall that light waves are transverse waves which can be reflected. To recall that.
Some mirrors are curved. These give distorted images. If a mirror curves inwards then it is a concave mirror; if it curves outwards it is a convex mirror.
Geometrical optics The Sun is our natural source of light. Objects such as the sun, a light bulb, a fire, which give off their own light are called.
PHYSICS – Reflection and Refraction. LEARNING OBJECTIVES Core Describe the formation of an optical image by a plane mirror, and give its characteristics.
Light rays and the laws of reflection help determine how and where an image is formed in a plane mirror. REFLECTION is the bouncing back of light.
PH 103 Dr. Cecilia Vogel Lecture 2. RECALL OUTLINE Ray model & depth perception Reflection law of reflection mirror images Polarization REMINDER.
© Boardworks Ltd 2003 KS4 Waves : Refraction. © Boardworks Ltd 2003 By the end of this lesson you should be able to: Define refraction Draw ray diagrams.
Reflection To review reflection of light To use a ray box safely To compare regular and irregular reflection To recall colour in terms of reflection.
LIGHT AND COLOUR Spot the mistake Angle of incidence = angle of reflection.
10.2 Properties of Light & Reflection. The Behaviour of Light: A reflection is the change in direction of a wave when it reaches the surface and bounces.
LIGHT. WHAT IS LIGHT? Light is a form of energy that travels away from the source producing it at a speed of 3 x 10 8 m s -1.
Unit 4 Optics: Properties of Light and Reflection SNC2D1 – Grade 10 Science.
1 of 6© Boardworks Ltd 2006 Reflection 2 December, 2015 Objectives Be able to describe what reflection is and draw ray diagrams. HSW: AF4: Using investigative.
1 of 47© Boardworks Ltd 2008 Light carries energy and travels as a wave. What is light? Light waves travel in straight lines. Light travels at a speed.
1 of 47© Boardworks Ltd 2008 Light. © Boardworks Ltd of 47 What is light?
Laws of Reflection From the Activity you performed, when you shine an incident light ray at a plane mirror, the light is reflected off the mirror and forms.
PW2 - Reflection. The angle of incidence is equal to the angle of reflection. The incident ray, reflected ray, and normal all line in the same plane.
© Boardworks Ltd 2003 Lenses. © Boardworks Ltd (c) Thin converging lens Core Describe the action of a thin converging lens on a beam of light.
Laws of Reflection and Plane Mirror Images. Reflection When light strikes a surface, some is absorbed, the rest bounces off the surface. This is called.
© Boardworks Ltd of 20 © Boardworks Ltd of 39 KS4 Physics Refraction.
Reflection pg. 75. Objectives State and apply the law of reflection. Locate an image created by reflection in a plane (flat) mirror by constructing a.
Reflections in a Plane Mirror. Geometric Optics The use of light rays to determine the path of light when it strikes an object Incident light: light.
Law of Reflection and Mirrors How Light can be Redirected.
Reflections in a Plane Mirror. MatterTransparentTranslucentOpaque Effect on incident light Transmits Transmits some Absorbs or reflects Effect on visibility.
Ray Diagrams & Reflection Images in plane mirrors.
Light Section 1. Light Hits an Object When light strikes an object, the light can be reflected, absorbed, or transmitted.
OBJECTIVE At the end of this lesson, you should be able to: –Describe the characteristic of the image formed by reflection of light. –Solve problem involving.
Reflection – Lesson aims To investigate the angle of incidence and angle of reflection, and find the pattern To find out the rules about where the image.
Plane Mirrors. The Ray Model of Light Light sources radiate light in all directions. The direction in which light travels is represented by lines with.
Last Word on Chapter 22 Geometric Optics Images in a Plane Mirror.
FLAT MIRRORS Chapter 13: Section 2. Learning Targets Describe how the angle of incidence is related to the angle of reflection Explain how surface.
Copyright © 2010 McGraw-Hill Ryerson Ltd. What is the law of reflection? How do mirrors form images? Topic4.4 (Pages )
10.3 Ray Model of light. Remember in our first talk, we discussed how images that are formed by light are created by BILLIONS of light rays coming from.
THE RAY MODEL OF LIGHT Section Light Travels In A Straight Line Light travels in a straight line. This fundamental property of light can be.
Reflection in Plane Mirrors Objectives: Investigate reflection in plane mirrors Verify the “1st Law of Reflection” Compare image location to object and.
Sound and Light Chapter 4: Light Section 1: Light and Color 3: / 52 = 68.67% 5: / 52 = 82.08% 6: 42.44/52 = 81.62%
Chapter 16.3 – Reflection and Color -every object reflects some light and absorbs some light light ray – a line in space that matches the direction of.
PHYSICS – Total Internal Reflection and Lenses. LEARNING OBJECTIVES Core Describe the formation of an optical image by a plane mirror, and give its characteristics.
Mirrors & Reflection Light We see objects because of reflected light Travels far and fast (3 x 10 8 m/s) Travels in a straight lines, called rays.
© Boardworks Ltd of of 45© Boardworks Ltd 2009.
Reflection in Plane Mirrors Reflection in Plane Mirrors Objectives: Investigate reflection in plane mirrors Verify the “1st Law of Reflection” Compare.
© Boardworks Ltd 2003 IGCSE Waves : Refraction. © Boardworks Ltd 2003 By the end of this lesson you should be able to: Define refraction Draw ray diagrams.
Light & Colour Revision Booklet Form Group Light travels away from its source in all directions.
10.2 Properties of Light and Reflection Copyright © 2010 McGraw-Hill Ryerson Ltd. All light, regardless of its source, behaves in the same way. In a natural.
Is a form of energy. Why is light important? Photosynthesis Electrical energy Heat To live!
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