# Reflection And Refraction Of Light Class 10 Notes Pdf

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## Light- Reflection and Refraction-Notes

Reflection of Light: The phenomenon of bouncing back of light into the same medium by the smooth surface is called reflection. Reflected light: Light which goes back after reflection is called reflected light.

Spherical Mirror: If the reflecting surface is part of the hollow sphere then the mirror is a spherical mirror. The spherical mirror is of two types:. Linear Magnification: This is the ratio of the height of the image to the height of the object. Use of Convex Mirror: Convex mirror used as rear view mirror in vehicles, as shop security mirrors, etc. Refraction of Light: The bending of light at the interface of two different mediums is called Refraction of light.

Refractive Index: It represents the amount or extent of bending of light when it passes from one medium to another. There are two types of refractive index. Refractive index of medium with respect to other medium is called Relative Refractive Index.

Refractive index of medium with respect to air or vacuum is called Absolute Refractive Index. An angle of incidence i : It is the angle between incident rays and perpendicular line normal at the point of incidence.

An angle of refraction r : It is the angle between refracted rays and perpendicular line normal at the point of incidence.

Lens: The transparent refracting medium bounded by two surfaces in which at least one surface is curved is called lens. Lenses are mainly two type. Center of Curvature: The centres of two spheres, of which lens is part is called the centre of curvature. Radii of Curvature: The radii of spheres, of which lens is part is called radius of curvature. Principal Axis: The line joining the centres of curvature of two surfaces of lens is called principal axis. Optical Center: It is a special point on the principal axis.

Light incident on the optical centre passes through the lens without deviation. Principal Focus: The point on the principal axis at which all incident rays parallel to the principal axis converge or appear to diverge after refraction through the lens. Use of Lens: In photographic cameras, magnifying glass, microscope, telescope, the human eye. There is a change in the wavelengths! The bouncing back of light when it strikes a smooth or polished surface is called reflection of light.

Reflection is of two types; Specular or regular and Diffuse or irregular reflection. The angle of incidence is equal to the angle of reflection. The least size of a plane mirror to view an object is equal to half the size of the object.

Centre of curvature : The centre of the sphere of which the mirror is a part is called the centre of curvature. It is denoted by C. Radius of curvature : The radius of the sphere of which the mirror is a part is called the radius of curvature. It is denoted by R. Principal axis : The straight line passing through the pole and the centre of curvature of the mirror is called the principal axis. Principal focus : It is a point on the principal axis at which the rays parallel to the principal axis meet after reflection or seem to come from.

For a concave mirror, the focus lies in front of the mirror and for a convex mirror, it lies behind the mirror. In short, a concave mirror has a real focus while aconvex mirror has a virtual focus.

Focal plane : A plane, drawn perpendicular to the principal axis and passing through the principal focus. Focal length : The distance between the pole and the focus is called the focal length. It is represented by f. The focal length is half the radius of curvature. Aperture: The size of the mirror is called its aperture. It is also defined as the effective diameter of the light reflecting area of the mirror.

Real image : When the rays of light, after reflection from a mirror, actually meet at a point, then the image formed by these rays is said to be real. Real images can be obtained on a screen. Virtual image: When the rays of light, after reflection from a mirror, appear to meet at a point, then the image formed by these rays is said to be virtual.

The following rays are used while drawing ray diagrams to find the position of an image :. For mirrors, the following results hold : u is — ve, if the object is in front of the mirror. Virtual object v is — ve, if the image is in front of the mirror. Virtual image Focal length of a concave mirror is taken as — ve. When the image formed by a spherical mirror is real, it is also inverted and is on the same side of the mirror as the object.

Since both v and u are negative, the magnification is negative. When the image formed by a spherical mirror is virtual, it is also erect and is on the other side of the mirror as the object.

Linear magnification is given by the expression. If m is positive, the image is erect w. The position of the image for various positions of the object for a concave mirror is as shown in the table below. The table also shows the use of the mirror for different positions of the object.

The position of the image for various positions of the object for a convex mirror is as shown in the table below. The bending of light when it travels from one medium into another is called refraction of light. As light travels from ,one medium to another, the frequency of light does not change.

The most familiar and widely used optical device is the lens. A lens is an optical system with two refracting surfaces. The simplest lens has two spherical surfaces close enough together that we can neglect the distance between them. Such a lens is called a thin lens. The two common types of lenses are Converging lens or Convex lens, Diverging lens or Concave lens.

It should be noted that, if the above lenses are surrounded by. Any lens that is thicker at its centre than at its edges is a converging lens with positive f, and any lens that is thicker at its edges than at the centre is a diverging lens with negative f.

Optical centre : The central point C in the lens is called the optical centre. If a ray is incident towards the optical centre, it passes undeviated. Principal axis: Since the lens contains two spherical surfaces, therefore, it has two centres of curvatures. The line joining these centres and passing through the optical centre is called principal axis. Aperture: The effective width of a lens through which refraction takes place is called the aperture. Focus and Focal Length : If a beam of light moving parallel to the principal axis of a convex lens is incident on it, the rays converge or meet at a point on the principal axis.

This point F is called the focus. The distance CF is called the focal length. If a beam of light moving parallel to the principal axis is incident on a concave lens, the beam of light diverges. If these diverged rays are produced backward, they meet at a point F on the principal.

The transmitted rays appear to come from this point. This point F is called the focus and distance CF is called the focal length. For drawing the ray diagrams, we note the following :. Image formation by a concave lens. Image formation by a convex lens. It is represented by m i. If the magnification of a lens is negative, then the image formed is inverted and real.

If the magnification of a lens is positive, then the image formed is erect and virtual. Power is defined as the reciprocal of the focal length. Power is measured in dioptre. Incident light: Light which falls on the surface is called incident light. The angle of incidence: The angle between the incident ray and the normal.

An angle of reflection: The angle between the reflected ray and the normal. Mirror: The surface which can reflect the light is a mirror. Plane Mirror: If the reflecting surface is a plane then the mirror is plane. The spherical mirror is of two types: Convex mirror: In this mirror reflecting surface is convex. It diverges the light so it is also called a diverging mirror.

Concave mirror: In this mirror reflecting surface is concave. It converges the light so it is also called converging mirror. Parameters of Mirror: Center of Curvature: The centre of hollow sphere of which mirror is a part. The radius of curvature: The radius of hollow sphere of which mirror is a part.

Pole: The centre of mirror middle point is pole. Principal axis: The line joining the pole and center of curvature is called principal axis. Aperture: Size of mirror is called aperture of mirror.

## Light Reflection and Refraction Class 10 Notes Science Chapter 10

Reflection of Light: The phenomenon of bouncing back of light into the same medium by the smooth surface is called reflection. Reflected light: Light which goes back after reflection is called reflected light. Spherical Mirror: If the reflecting surface is part of the hollow sphere then the mirror is a spherical mirror. The spherical mirror is of two types:. Linear Magnification: This is the ratio of the height of the image to the height of the object.

A group of rays of light emitted by a source of light is called a beam of light. A light beam is of three types. Reflection of Light : There are some surfaces which have ability to send the light back in the same medium when light strikes it. Image : When light rays meet or appear to meet after reflection from a mirror,then it is called an image. Real Image : It is a kind of image which is formed by actual intersection of light rays after reflection. Virtual Image : It is a kind of image which is formed by producing the reflected rays backward after reflection.

CBSE Class 10 Science Notes Chapter 10 Light Reflection and Refraction Pdf free download is part of Class 10 Science Notes for Quick.

## Light Reflection and Refraction Class 10 Notes

SelfStudys provides chapter-wise Science Revision Notes and short key notes for the CBSE board examination in free downloadable PDF format so students can practice it for their studies and get better in their board examinations. These core subjects can be very difficult for students and the revision notes for every chapter will enable them to have a skilful studying pattern with which they can achieve so much better and also enjoy studying the subject. Last-minute revision is never easy.

Students preparing for their board examination can go through Class 10 science light reflection and refraction notes to review important concepts quickly. It will also enable them to gain a comprehensive understanding of the same.

### NCERT Solutions for Class 10 Science Chapter 10

Register Now. Hey there! We receieved your request. Most common type of curved mirrors are spherical mirrors. Mirrors in which reflecting surface are spherical in shape, is known as spherical mirrors. Reflecting surface of a mirror can be curved inwards or curved outwards. The one which is curved inward is known as concave mirror and the one which curved outwards is known as convex mirror.

Download revision notes for Light Reflection and Refraction class 10 Notes and score high in exams. These are the Light Reflection and Refraction class 10 Notes prepared by team of expert teachers. The revision notes help you revise the whole chapter in minutes. Revising notes in exam days is on of the best tips recommended by teachers during exam days. In this chapter we will study the phenomena of reflection and refraction using the property of light i. Ray of light : It is a line in the direction of movement of light. Beam of light : It is bucnh of rays of light.

Revision is one of the most important aspects of learning as it helps you to remember facts, figures, and topics that you have covered earlier. Students are always advised to summarize whatever they have learned as Revision Notes. Reflection is the change in the direction of a wavefront, at an interface between two different media, so that the wavefront returns into the medium from which it originated. Reflection of light is either specular reflects all light at the same angle or diffuse reflects in a broad range of directions depending on the nature of the interface. There are some surfaces that have the ability to send the light back in the same medium when light strikes it. This phenomenon of sending the light back in the same medium by a surface is called a reflection of light. The incident ray, the reflected ray, and the normal to the surface at the point of incidence, all lie in the same plane.

These notes are prepared by our panel of highly experienced teachers keeping in mind the level of preparation needed by the students to prepare for Class 10 board exams. Light Reflection and Refraction Class 10 Notes aims at easing out your learning and revision process. Reflection is one of the unique properties of light. It is the reflection of light, which enables us to see any object. Reflection: The bouncing back of rays of light from a polished and shiny surface is called reflection or reflection of light. It is similar to bouncing back of a football after colliding with a wall or any hard surface.

Learning the important concepts is very important for every student to get better marks in examinations. The concepts should be clear which will help in faster learning. Class X: Physics.

Download all answers in PDF file format or download Offline apps to use all the contents offline without internet. So, 10th Science chapter 10 question answers are useful for UP Board students also. Properties of images formed by a plane mirrors: i The image formed by a plane mirror is virtual and erect. Properties of the image formed by a convex mirror: i This image is always virtual and erect.

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