# Unit 1: Reflection - MT Physics Portal

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Unit 1: Reflection Sec 2 Science - Physics

Learning Outcomes Students should be able to: 1. Understand that light travels in a straight line 2. Define the terms used in reflection, including normal, angle of incidence and angle of reflection. 3. State that, for reflection, the angle of incidence is equal to the angle of reflection and use this principle in constructions, measurements and calculations. 4. Describe the image formed by a mirror. Sec 2 Science - Physics

The Speed Of Light! Snail 0.04 m/s Aeroplane 350 m/s Sec 2 Science - Physics Cheetah 31.0 m/s (116km/h) Earth orbit round the sun 29780 m/s Sound waves 330 m/s Speed of light in vacuum 300000000 m/s (3x108 m/s)

light travels in straight lines Do you agree? How do you know? Sec 2 Science - Physics

Why or How does Solar Eclipse occurs? Sec 2 Science - Physics

Therefore . pticsu/solar/index.html Sec 2 Science - Physics

light travels in straight lines The path along which light energy travels is called a ray. Represented by a straight line with an arrow to show its direction of motion. A beam of light is a bundle of light rays. Question: How many light rays can we have from a beam of torch light? Sec 2 Science - Physics

light travels in straight lines A beam of light is a bundle of light rays. parallel beams converging beams diverging beams Formation of sharp shadows and eclipses are evidence that light travels in straight lines. Sec 2 Science - Physics

Test Yourself! 1. What is the speed of light? 2. How does light travel? 3. Name three kinds of light beams. Sec 2 Science - Physics

Reflection Sec 2 Science - Physics

Sec 2 Science - Physics

Sec 2 Science - Physics

Is Simon correct? My name is Simon, My mummy says that light only gets reflected by mirror. I think SHE BLUFFED ME! Sec 2 Science - Physics

diffused and regular reflection parallel incident rays parallel reflected rays smooth surface regular reflection An image is formed Sec 2 Science - Physics parallel incident rays scattered reflected rays rough surface diffused reflection No image is formed

Reflection When you look into a mirror, you see a picture of yourself. What you see is called an image. Where do you think the light originates from? Sec 2 Science - Physics

Reflection We are able to see an object only when the light rays coming from it enter our eyes. direct source of light reflected light luminous objects emit light and we are able to see them directly Sec 2 Science - Physics non-luminous objects are seen only because they reflect light from a source

Reflection Definition: The image in a mirror is formed when light rays bounce off the mirror and travel to your eyes. This bouncing of light off a mirror is called reflection. Sec 2 Science - Physics

Let’s Think! When we look into an image of our own into the mirror, what are the properties of the image can we observe? 1. Upright Sec 2 Science - Physics

image on mirror The characteristics of the image formed in the plane are: virtual upright same size as object same distance behind the mirror as the object is in front laterally inverted Sec 2 Science - Physics

Some random thoughts Film makers always thwart the laws of Physics to achieve some creepy effects for ghost stories! Sec 2 Science - Physics

Tracing the reflected rays plane mirror incident ray i r normal reflected ray Laws of reflection The angle of incidence is equal to the angle of reflection. The incident ray, the reflected ray and the normal at the point of incidence all lie on the same plane. Sec 2 Science - Physics

Laws of reflection Angle of incidence, i Angle of reflection, r Sec 2 Science - Physics 30 45 60 75

image on mirror The laws of reflection are true for all reflecting surfaces (plane mirrors and curved mirrors). clear glass acts as mirror object position of image graph paper The image formed in a plane mirror has same distance behind the mirror as the object is in front. Sec 2 Science - Physics

image on mirror The image formed in a plane mirror is laterally inverted. Sec 2 Science - Physics

Lesson Summary We learnt about: The speed of light Light travels in a straight line Diffused and regular reflection Properties of image Tracing of the reflected ray Sec 2 Science - Physics

Constructing Ray Diagrams Sec 2 Science - Physics

Behavior of an image An image is always found behind the mirror. The distance away from the mirror is always the shortest distance that it can find itself towards the mirror. Sec 2 Science - Physics

ray diagrams and images Usually, we do not use protractor to construct a ray diagram by a mirror. plane mirror image Sec 2 Science - Physics object

Constructing Ray Diagrams Step 1: Image distance from mirror object distance from mirror Measure accurately the perpendicular distance between object O and the mirror surface. Mark off the same distance behind the mirror to locate image I Fig 12.18 Sec 2 Science - Physics

Constructing Ray Diagrams Step 2: Draw the light rays from the image to the eye Use dotted lines behind the mirror Use bold lines in front of the mirror surface. Sec 2 Science - Physics

Constructing Ray Diagrams Step 3: Draw the incident rays from object O to the point of incidence on the mirror surface. Note that the angle of incidence angle of reflection Sec 2 Science - Physics

Constructing Ray Diagrams -reflection/index.htm Sec 2 Science - Physics

Constructing Ray Diagrams Drawing ray diagram for extended object By considering the extended object as a number of points, we apply the same 3 steps to locate the image. Sec 2 Science - Physics

Constructing Ray Diagrams Multiple images in plane mirrors When two mirrors are placed 90o to each other, and an object O is placed between them, 3 images are formed. Sec 2 Science - Physics

using reflection: the periscope A periscope can be used to ‘look’ over high obstacles such as a wall. object mirror image appears to come from the back mirror Final image appears without lateral inversion. Sec 2 Science - Physics

using reflection: Optical Testing Optical Testing Plane mirrors are used to reduce the distance required for optical testing Sec 2 Science - Physics

using reflection: Optical Testing Test Yourself An optician’s eye chart is fixed 0.5 m behind the eyes of a patient looking into a mirror placed 3.0 m in front of him. Find the distance of the chart as seen by his eyes. mirror 3.0 m Patient’s eye 3.5 m Sec 2 Science - Physics Chart

using reflection: Optical Testing Test Yourself An optician’s eye chart is fixed 0.5 m behind the eyes of a patient looking into a mirror placed 3.0 m in front of him. Find the distance of the chart as seen by his eyes. Answer: The distance of the eye chart is 3.5 m from the mirror. Hence the image of the eye chart is 3.5 m in the mirror. Therefore chart’s image is 6.5 m away from the patient’s eyes. Image mirror 3.5 m Sec 2 Science - Physics 3.0 m Patient’s eye 3.5 m Chart

diffused and regular reflection In photography, light is sometimes reflected off a rough white surface to diffuse light. the shadows that form are less sharp the picture is more pleasant to the eye Sec 2 Science - Physics

What is the minimum length of a mirror to see one’s own full image? Does the image size change as the object distance changes? Sec 2 Science - Physics

x (x y)/2 y Sec 2 Science - Physics

What is the minimum length of a mirror to see one’s own full image? Does the image size change as the object distance changes? Sec 2 Science - Physics

Making use of mirror to make rooms look bigger Sec 2 Science - Physics

Sec 2 Science - Physics Learning Outcomes Students should be able to: 1. Understand that light travels in a straight line 2. Define the terms used in reflection, including normal, angle of incidence and angle of reflection. 3. State that, for reflection, the angle of incidence is equal to the angle of reflection and use this

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