Reflection and refraction of light

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

CHAPTER - 10 LIGHT : REFLECTION AND REFRACTION

Optics Curved Mirror Real or Virtual 1. A real image is formed by the intersection of light rays from a pint of the object. 2. The term ‘virtual” is.

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.

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.

LIGHT THIN LENSES Name: ________________ Class: _________________

Suppose that you hold the transparency in the photograph below in front of a mirror. How will its reflection appear? Is the image: (1) inverted top-to-bottom?

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

Mirrors and Lenses: Mirrors reflect the light Lenses refract the light.

DEMONSTRATE UNDERSTANDING OF WAVES AS 2.3 LIGHT 4 WEEKS WAVES 4 WEEKS.

Converging Lenses Graphical Analysis By Chris Cho and Dan Fan.

What is the vertical dashed line called?

2 nd & 3 th N.U.T.S. Workshops Gulu University Naples FEDERICO II University 3 – Imaging (thin lenses and spherical mirrors)

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

Focal Point of a Converging Lens Parallel rays from a distant source of light. Are all redirected to the focal point. Focal length f (meters) A flatter.

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

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.

Concave/Convex Mirror Image Formation Rules 1.Parallel Rays - Light rays parallel to the principal axis are reflected through the focus of the mirror.

Convex Lens A convex lens curves outward; it has a thick center and thinner edges.

Ch18.1 Mirrors Concave mirror All light rays that come in parallel to the optical axis, reflect thru the focal point. All light rays that come in thru.

Spherical Mirrors Spherical mirror – a section of a sphere of radius R and with a center of curvature C R C Mirror.

Geometric Optics Conceptual Quiz 23.

Grade 10 Applied Science – Curved Mirrors

Lenses and Mirrors. How does light interact with pinholes? How does light interact with lenses? –___________ How does light interact with mirrors? –___________.

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

 Mirrors that are formed from a section of a sphere.  Convex: The reflection takes place on the outer surface of the spherical shape  Concave: The.

Physics 014 Images. Topics  Plane mirrors  Spherical mirrors  Thin lenses.

1.What is the fundamental difference between a real image and a virtual one? 2.Parallel light rays are focused on the focal point of a concave mirror.

Lenses 2. CALCULATIONS USING THE LENS FORMULA Calculate the distance of the image to the converging lens in the following situations object distance /cmFocal.

Types of mirror When we draw a ray diagram we represent a mirror by drawing a line with dashes on the silvered (non-shiny) side. Most mirrors are flat.

JOHN WANGOMBE BAHATI PCEA SECONDARY SCHOOL THIN LENSES.

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

ReflectionReflection and Mirrors The Law of Reflection always applies: “The angle of reflection is equal to the angle of incidence.”

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

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

Refraction of light through a Convex Lens. Lens diagram a cross section through the centre plane.

Lenses Convex lenses converge rays of light. Parallel rays converge a fixed distance away from the lens. This is known as the focal length.

Images Formed by Lenses Ray Diagrams for Lenses Ray diagrams can be used to predict characteristics of images using 3 rays, just like for concave.

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

CLASS :- X MADE BY :- MANAS MAHAJAN © Galaxysite.weebly.com - All Rights Reserved.

Revision of terminology and drawing a Ray diagram

Q UADRATIC E QUATIONS  Activity  Assess Knowledge Class X / Term II / Math 1 Creative Commons License Content Sourced and Aggregated by Centre for Positive.

C OAL AND PETROLEUM 1 Creative Commons License Content Sourced and Aggregated by Centre for Positive Learning Supported by TCS iON Learning Exchange 

T HRUST & P RESSURE 1 Creative Commons License Content Sourced and Aggregated by Centre for Positive Learning Supported by TCS iON Learning Exchange 

LIGHT 1 Creative Commons License Content Sourced and Aggregated by Centre for Positive Learning Supported by TCS iON Learning Exchange  Activity  Assess.

S TARS AND THE SOLAR SYSTEM 1 Creative Commons License Content Sourced and Aggregated by Centre for Positive Learning Supported by TCS iON Learning Exchange.

Can you list out other applications of lenses?

Experiment to measure the focal length of a concave mirror.

Chapter 18 Mirrors and Lenses. Curved Mirrors Concave shaped mirrors cause parallel light rays to converge. Convex shaped mirrors cause parallel light.

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.

By JSC NAREN VII B. SL NO TOPIC 1LIGHT TRAVELS IN A STRAIGHT LINE 2REFLECTION OF LIGHT 3RIGHT OR LEFT 4PIN HOLE CAMERA 5CONCAVE SPHERICAL MIRROR 6CONVEX.

Ying Yi PhD Lab 5: Lenses 1 PHYS II HCC. Outline PHYS II HCC 2 Basic concepts: image, convex lens, concave lens, focal length Lab objectives.

3.3 Images formed by a concave lens

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

Reflection of light. Reflection of light A highly polished surface, such as a mirror, reflects most of the light falling on it. We are already familiar.

PHYSICS – Total Internal Reflection and Lenses

Lenses Chapter 5.

Thin Lenses-Intro Notes

CURVED MIRRORS.

Spherical Mirrors – Learning Outcomes

Image formation by spherecal mirrors

Learning Objectives To observe the effect of light travelling in straight lines on the formation of images To observe a ‘real’ image To apply the laws.

Types of mirror When we draw a ray diagram we represent a mirror by drawing a line with dashes on the silvered (non-shiny) side. Most mirrors are flat.

Thin Lens Equation 1

Presentation transcript:

Reflection and refraction of light Activity Assess Knowledge Class X / Term II / science Creative Commons License Content Sourced and Aggregated by Centre for Positive Learning Supported by TCS iON Learning Exchange

Activity 1 Topic 1 To determine the focal length of a concave mirror by obtaining image of a distant object. Objective A concave mirror obeys the laws of refection of light. When parallel rays of light fall on meet at a point in front of the mirror after reflection from it. This point is the focus of the mirror. Class X / Term II / Science

Activity 1Contd… Pre-requisite Knowledge Image formation of a distant object by a concave mirror. Materials required A concave mirror, a mirror holder, a small screen fixed on a stand, and a measuring scale. Class X / Term II /Science

Activity 1Contd… Steps to perform the activity 1. Fix a concave mirror in the mirror holder and place it on the table near an open window. Turn the face of mirror towards a distant object (a tree or an electricity pole or a distant building). 2. Place the screen fitted to a stand in front of the concave mirror. Move the screen back and forth until a sharp, clear and inverted image of the distant object is formed on it. A clear and bright image could be obtained if the distant object, say a tree or a building, is illuminated with sunlight and the screen is placed in the shade. A bright image of the sun could also be obtained if the sunlight is made to fall directly on the concave mirror. 3. Mark the position of the centre of the stand holding the mirror and the screen when a sharp image of the distant object has been obtained on the screen. Measure the horizontal distance between the centre of the concave mirror and the screen with the help of a measuring scale. Record your observations in the observation table. 4. Repeat the experiment two more times by obtaining the images of two different distant objects. Measure the distance between the concave mirror and the screen in each case. Record them in the observation table. 5. Find the mean value of the focal length. Class X / Term II /science

Activity 1Contd… Demonstration Class X / Term II / science

Activity 1Contd… Conclusion The approximate value of focal length of the given concave mirror is____ m. Class X / Term II / science

Activity 2 Topic 2 To determine the focal length of a thin convex lens by obtaining image of a distant object. Objective when a parallel beam of light falls on the convex lens, the rays, after refraction converge at a point on other side of lens. This point is one of the two foci of the lens. Class X / Term II / science

Activity 2Contd… Pre-requisite Knowledge Image formation of a distant object by a convex mirror. Materials required A thin convex lens, a lens holder, a small screen fixed to a stand, and a measuring scale. Class X / Term II / science

Activity 2Contd… Steps to perform the activity 1. Fix a thin convex lens on a lens holder and place it on the table or platform near an open window through which sufficient sunlight enters. Turn the face of lens towards a distant object (a tree or an electricity pole or a distant building). 2. Place the screen fixed to a stand on the other side of the lens. Adjust the position of screen (by moving it back and forth in front of the convex lens) to get a sharp, clear and inverted image of the distant object on it. A clear and bright image could also be obtained if the distant object, say a tree of a building is illuminated with sunlight and the screen is kept in the shade. A bright image of the sun could also be obtained if the sunlight is made to fall directly on the lens. 3.Mark the position of the centre of the stands holding the lens and that of the screen when a sharp image of the distant object has been obtained on the screen. Measure the horizontal distance between the centre of the convex lens and the screen with the help of a measuring scale. Record your observations in the observation table. 4. Repeat the experiment two more times by obtaining the images of two different distant objects. Measure the distance between the convex lens and the screen in each case. Record them in the observation table. 5. Find the average or mean value of the focal length. Class X / Term II / science

Activity 2Contd… Demonstration Class X / Term II / science

Activity 2Contd… Conclusion Class X / Term II / scince

Assess Knowledge CCE Questions (5 Marks) Define the term reflection. Which mirror has a large field of view? Which mirror is used by dentists? What is a lens? State the laws of reflection. Class X / Term II / science