What is the minimum height of the mirror, and how close must its lower edge be to the floor, if she is to be able to see her whole body. Ronald galli and farhang amiri weber state university, ogden, utah 844082508 received 14 september 2011. The phenomenon of coming back to the light in the same medium when it falls on a surface is known as the reflection of light. Reflection of light from a plane mirror is regular reflection and reflection of light from plane sheet of paper is irregular reflection of light. If a vector in the object plane makes an angle, 90. Kinds of reflection regular reflection regular reflection occurs when a beam of light falls on a smooth and polished surface such as a plane mirror. Ideally, a plane mirror consists of a perfectly flat surface with no distortions, and bounces 100 percent of the light that strikes it incident light back at a predictable angle. Berkowitz prepared for directorate of computers electronic systems division air force systems command united states air force l. Plane mirrors, which include the common bathroom and hallway mirrors used daily, produce a virtual image at the same magnification and distance as the object they reflect.
Figure 31a shows ordinary reflection of light at a plane surface, and. The law of reflection applies, just as it does for a plane mirror, i. Mcq questions for class 10 science light reflection and. For plane mirrors, the reflected image a virtual image and object are.
It is formed at the same distance behind the mirror as the object is in front of the mirror. Light reflection and refraction class 10 notes science. Pdf the purpose of this chapter is to show how an analysis of the perception of. May 12, 2019 worksheet 3 pages and homework 1 page with answers for mirror diagrams, including the law of reflection angles of incidence and reflection equal, and the concept of virtual images. The figure below shows the reflection of an incident beam on a plane mirror. A plane mirror b convex mirror c concave mirror d irregular reflecting surface. The angle at which light strikes a plane mirror from an object. Mar 05, 2015 in this video we will learn the law of reflection and then learn how to draw a ray diagram to describe an image. Convergence of concave mirror can be decreased by dipping in.
Hanscom field, bedford, massachusetts project 508g prepared by the mitre corporation. It reflects off the second mirror and exits the system what will the angle of reflection be at the second reflection. A plane mirror makes an image of objects in front of the mirror. A mirror is tilted at an angle of 30 o to the bench. Reflection of light through plane mirror problem l1. Students work with a partner and complete four investigation activities. Suppose three planes meet at a single point and that one side of each plane is designated as the reflecting side. The reflection of light from a plane mirror can be summarised by the following laws. Light from the object emanates in a variety of directions. A general principle for light reflecting from a uniformly. It is a kind of image which is formed by producing the reflected rays backward after.
The angle of incidence is equal to the angle of reflection 2. Light ray diagrams plane mirrors teaching resources. When it hits an object, one that is not smooth, the rays will bounce at many different angles. Mirror, mirror on the wall eight lessons on mirrors. Mar 19, 2018 cbse class 10 science chapter 10 light reflection and refraction notes in pdf are available for free download in mycbseguide mobile app. These mirrors are made by putting a thin layer of silver nitrate or aluminium behind a flat piece of glass. The incident ray, the normal to the mirror at the point of incidence, and the reflected ray, all lie in the same plane. The incident ray makes an angle with the normal to the. If a parallel beam of light is incident on a plane mirror, the reflected beam is also parallel and it is in a fixed direction. Dec 18, 2015 our topic for today is laws of reflection. Example of mirror reflection from the disco ball and.
Diffusedirregular reflection is a nonmirrorlike reflection of light. Chapter 7 reflection of light icse selina solutions for. The angle of the incidence is the angle between the incident ray and the surface normal an imaginary line perpendicular to the surface. Light reflection in a plane mirror physics science. Before the mirror has rotated, the angle of incidence is. Lakhmir singh physics class 10 solutions reflection of light. This is called regular reflection irregular reflection irregular reflection occurs when a. Reflection and refraction quiz questions proprofs quiz. When light from an object is reflected successively from plane mirror surfaces, a rotated image is produced. Water fills in the rough areas and makes the surface smoother.
Given a single plane mirror, the differences between real and reflected bodies fall. Chapter 10 light reflection and refraction notes download in pdf which has explanation of light reflection and refraction, light reflection and refraction class 10, light reflection and refraction class 10 notes, reflection and refraction of light. For each light ray incident to the mirror, accurately draw the corresponding reflected ray. The rays of a parallel beam of light do not remain parallel after reflection from.
Figure 1 shows an example of reflection from a plane surface such as mirror. Plane mirrors flat mirrors with light, if one thinks of light bouncing off an object, it travels in all directions. Reflection of light in a plane mirror the reflection take place according to the following laws of reflection of light. The point at which the incident ray strikes the mirror. The laws of reflection determine the reflection of incident light rays on reflecting surfaces, like mirrors, smooth metal surfaces, and clear. A mirror is a reflective surface that does not allow the passage of light and instead bounces it off, thus producing an image. Reflection and refraction key points the ray model of light reflection and mirrors refraction, snells law total internal reflection references. A ray of light strikes a reflective plane surface at an angle of 42 o with the surface. Students experiment with reflection to trace patterns. Reflection when a ray of light strikes a plane mirror, the light ray reflects off the mirror. The formation of images by a plane mirror conceptual example. Draw ray diagrams showing the image formation by a convex mirror when an object is placed at infinity 2. Reflection of light with two plane mirrorsdouble mirrors placed at a 90degree angle a b objective science and mathematics standards materials theory when you place two plane mirrors at a 90degree angle, the image of the first mirror is reflected in the second mirror so that the reversed mirror image is reversed again, and you see a true. List four properties of the image formed by a plane mirror.
Class 10 science chapter 10 light reflection and refraction. Diffuse reflection also follows this rule, but due to the roughness of the surface, the light rays are reflected in all directions figure 2b. Light reflection and refraction notes for class 10. This is called regular reflection irregular reflection. Light rays that fall upon a surface are called incident rays. The reflection of a planepolarized wave on a moving mirror is associated with the aberration of light effect. Here, the angle of incidence and angle of reflection are with respect to normal to the reflective surface. Multiple reflections a person is sitting in front of two mirrors that intersect at a right angle. When you look at the image of a candle in a plane mirror, you see a real image. Worksheet 3 pages and homework 1 page with answers for mirror diagrams, including the law of reflection angles of incidence and reflection equal, and the concept of virtual images.
When light strikes a perfectly reflecting surface, such a mirror for example, all the light. Image 2 is a single reflection image from mirror 2. The incident ray, the reflected ray, and the normal. We hope the given mcq questions for class 10 science light reflection and refraction with answers will help you. What happens when a ray of light falls normally or perpendicularly on the surface of a plane mirror. How can we describe the images formed by plane mirrors. A ray of light is directed so that it hits the mirror at an angle of 40 o to the surface of the mirror as shown.
Geometric optics the use of light rays to determine the path of light when it strikes an object incident light. In this science lab, students experiment with reflection using plane mirrors. For light rays striking a plane mirror, the angle of reflection equals the angle of incidence. Applying this to triangles \pab\ and \qab\ in figure \\pageindex1\ and using basic geometry shows that they are congruent triangles. If you have any query regarding cbse class 10 science chapter 10 light reflection and refraction multiple choice questions with answers, drop a comment below and we will get back to you at the earliest. In this lab, you will study reflection of light from different mirrors.
Reflection of light and image formation on a plane mirror. The basics of reflection, some interesting problems. When you shine the light from a laser pen or a narrow and parallel beam of light from a flashlight onto a mirror please try the set up of figure 31, then quite surprisingly one does not see a light spot on the mirror. Reflection of light with two plane mirrors double mirrors. Adjust the mirror carefully so that the mirror is parallel to line. Diffusedirregular reflection is a non mirror like reflection of light. The most common mirrors are flat and called plane mirrors. This scattering is caused by the interaction of light with small particles, even atoms or molecules, within the material. Under what condition in an arrangement of two plane mirrors, incident ray and reflected ray will always be parallel to each other, whatever may be angle of incidence. Selina concise physics class 9 icse solutions reflection. To determine a general principle which describes the manner in which light reflects off a plane mirror surface. What general principle could be made to describe how light reflects off a plane mirror surface. The incident ray, the reflected ray and the normal at the point of incidence, lie in the same plane. Reflection of light with a plane flat mirror trace a.
Get an answer for describe an experiment to illustrate the laws of reflection. Diffuse reflection occurs when light is reflected in many directions from a rough surface. Different cases of reflection and image formation in plane mirror. The best app for cbse students now provides light reflection and refraction class 10 notes latest chapter wise notes for quick preparation of cbse board exams and school based annual examinations. Ncert science class 10 chapter 10 part 2 reflection of.
Describe an experiment to illustrate the laws of reflection. Pdf contrariety in plane mirror reflections researchgate. A plane mirror is the kind of mirror youre probably most used to using, although if social media are any indication, selfies had largely come to replace actual mirrors early in the 21st century. In this type of reflection rays of light that hit an irregular object with a rough surface, are reflected back in all directions. When a light ray strikes a surface separating two media with different optical properties, part of the light energy is reflected back to the media where it coming from. Use a light source, threeway mirror, rhombus prism, and protractor to measure angles of a light ray. Reflection and refraction 17 be scattered away from its original direction figure 2. Silver metal is one of the best reflectors of light. We can predict where the incident light ray will go after reflection. The light beam is reflected in a particular direction and can only be seen in that direction. I am not able to understand that if both are reflecting surafces why does a plane mirror form an image but a rough surface doesa not. Light reflection and refraction 161 let us recall these laws i the angle of incidence is equal to the angle of reflection, and ii the incident ray, the normal to the mirror at the point of incidence and the reflected ray, all lie in the same plane. Plane mirrors iv a corner mirror is created when two plane mirrors are connected at a 90 angle.
Consider a planemirror and a fixed incident ray of light reflecting from the surface at an angle. However,irregular surfaces also do the same and it is called irregular reflection. These laws of reflection are applicable to all types of reflecting surfaces. The angle of incidence is equal to the angle of reflection. A plane mirror is a mirror with a flat reflective surface. A plane mirror of circular shape with radius r 2 0 c m is fixed to the ceiling. In the study of how light behaves, it is useful to use light rays and the fact that light travels in straight lines. Images formed by a plane mirror are always virtual. From this, we know that the triangles created by the light rays. A plane mirror is a flat mirror that reflects light and produces a virtual image without the interference of an inward or outward curve. An object denoted by a dark circle is placed in front of a plane mirror as shown below. Reflection plane mirrors you will find details of reflection in the 1114 section of the site but some basic facts will be summarised here with a few more advanced topics. According to the law of refraction, light passing from air to glass will cause the light to. When light strikes the boundary between two media, three things may happen.
Images formed by a plane mirror are of same shape and size as that of an object. Illustrate graphically the reflection of light from plane, convex, and concave concave mirrors. Mirrors we use on our dressing tables in our home are plane mirrors. A circular area of radius r 1 m on the floor is to be illuminated after reflection of light from the mirror. Students record observations and try to write their name so it can be read in the mirror. Light rays are basically wave motions and they are capable of being reflected by an interface in between two mediums. Hello friends, check out our video on light reflection in a plane mirror i hope you enjoy this online lecture on light reflection in a plane mirror by letstute.
A ray of light is the straight line along which the light traveled and a bundle of light rays is called a beam of light. Chapter 34a reflection and mirrors geometrical a powerpoint presentation by paul e. The position of image is the point of divergence or convergence of reflected rays. When light strikes a perfectly reflecting surface, such a mirror for example, all the light energy is reflected. Pdf plane mirror in geogebra laboratory researchgate.
As ray of light falls normally on mirror, this means that angle of. Notes on reflection of light at plane surface grade 11. Use a protractor, straightedge, and the law of reflection. Regular reflection occurs when a beam of light falls on a smooth and polished surface such as a plane mirror. Reflection and mirrors the following information is provided to the student.
Explain why the reflection of light off ground glass changes from diffuse to specular if you spill water on it. The process of sending back light rays which falls on the surface of an object is called reflection of light. The angle of incidence i is equal to the angle of reflection r 2. Set up the plane mirror in its holder on the mirror line so that the actual mirror surface is on the line. If light from a real object incident on a plane mirror, the rays incident will be diverging. Image 1 is a single reflection image from mirror 1. As power of the plane mirror is zero, hence, it neither converges nor diverges the rays.
The principal axis of the mirror is a straight line drawn through the center of curvature c and the midpoint of the. A general principle for light reflecting from a uniformly moving mirror. Place a sheet of paper on the cork board, and draw a straight line near the top of the paper. A plane mirror which is a highly polished surface reflects the light on it. The law of reflection says that all light reaching a boundary between two surfaces is reflected. Reflection and refraction choose appropriate alternative.
Students write their names and hold them up to the mirror. Here, the incident ray which is reflected along with reflected ray doesnt have the same angle to the normal as the incident ray. The law of reflection tells us that the angle of incidence is the same as the angle of reflection. Light reflection and refraction notes for class 10 download pdf. A plane mirror is a mirror with a flat planar reflective surface.