we respect your privacy and take protecting it seriously, Updated on: 24 Oct 2019 by Rujuta Pradhan. Today scientists say light is a form of energy made of photons. Such a reflection is known as diffuse reflection or irregular reflection . The reflection occurs at the silver and this is protected by a layer of paint. The light rays may be the self or reflected rays of object(i.e., they can either be luminous or non-luminous). Light is defined as a form of electromagnetic radiation emitted by hot objects like lasers, bulbs, and the sun.. Light contains photons which are minute packets of energy. I have recommended this to my several friends ...this is perfect lecture notes I've ever seen.. Every single day before exam I remind myself to read from read the notes from dron ones before in leave to exam ..!! i) Object between Principal Focus (F) and Pole (P): When the object is placed between principal focus and pole of a concave mirror, an enlarged, virtual and erect image is formed behind the mirror. Light is unique in that it behaves like both a particle and a wave. Some substances, such as the plastic shopping bag, allow some light to pass through, but not all of it. In the case of a convex mirror, parallel rays coming from infinity appear to be diverging from behind the mirror. Better notes thanks to help my study i really really Thank you. A particle is a minute fragment or a quantity of matter with certain properties, such as mass and volume. A 160-page, text-led read for ages 8–12. Is It Better To Cover A Sneeze With Your Hand Or Elbow. from rarer to denser medium it bends towards the normal making the angle of refraction smaller than angle of incidence. vii)Focal length: The distance from pole to focus is called focal length. iv) Aperture: The diameter of reflecting surface of a spherical mirror is called aperture(shown as MM’.i.e., vertical line joining M and M’). The sign for distance is given as per convention. Light has no mass and is not really considered matter. I think everyone should use dronstudy notes, Sir yeah sirf Reflection waale notes hai. The reflecting surface of such mirrors can be considered to form a part of the surface of a sphere. However, the light pattern on the screen was more diffused/ diffracted, which indicated that light has an interference property, just like those exhibited by energy waves. He went on to argue that the higher the oscillation frequency of the photons that strike, the greater the electron energy that will come flying out. In air= Slightly less than the speed of light in vacuum. Science of Light. Light is a form of energy that we can see. The absolute refractive index of a medium is simply called its refractive index. Optical Density--is an inverse measure of the speed of light through the medium. How Does A Bug Manage To Stay Level In A Car That’s Driving At 100 Km/h? If i is the angle of incidence and r is the angle of refraction, then. Light, reflection and shadows are all part of primary-school science. Light travels with different speed in different medium. I like them . Hello Ruqaiyah this is our sample video for full video Please call on 9026272829, fablous notes and very useful notes for me and thanks Dron Study.Com, Its good but pure chapter ki notes nahi hai yar, Hello Dhaval this is sample notes for full notes Please call on our help line number 8287971571. The wave nature of light was first illustrated through experiments on diffraction and interference.Like all electromagnetic waves, light can travel through a vacuum. Thanku dron study for easy notes in easy language, Best ever notes of science, notes are detailed ones .each word is easy to understand. Image formation by convex lens by placing objects in the following positions: (a) Between principal focus, F1 and optical centre, O:-. Glad to know that our study material helped you in your studies. Let speed of light in air is 'c' and the speed of light in given medium is 'v'. Light energy is a kind of kinetic energy with the ability to make types of light visible to human eyes. Dron I have a very humble request ..can you please get the notes for grade 11 too ..we would be so greatfull and thankfull for this. In the case of a concave mirror, parallel rays coming from infinity converge after reflection in front of the mirror. i)Convex lens: A lens that has two spherical surfaces, bulging outwards is called a double convex lens. These reflected rays when produced backwards meet at the point A'. Optically denser medium and optically rarer medium: Optical dense refers to the index of refraction. Relation among magnification, distance of object and distance of image: Where, m = magnification, h' = height of image, h = height of object, v = image distance and u = object distance. ii)A spherical mirror, spherical mirror whose inner is polished and outer side is the reflecting surface is called convex mirror. IF WE GO TO TUTION WE ONLY WASTE OF TIME What Would Happen If You Shot A Bullet On A Train? vi)Focus or Principal Focus: Point on principal axis at which parallel rays coming from infinity converge after reflection is called the Focus or Principal Focus of the spherical mirror. In doctor’s head mirror to see details of various body parts like nose, ears etc. c)A pool of water appears to be less deep than it is actually is : The refraction of light at the surface of water makes ponds and swimming pools appear shallower than they really are. Then it moves out of the glass slab into air. An infinitely large, real and inverted image is formed at infinity when object is placed at principal focus, F1 of a convex lens. Objects through which we can see clearly are called transparent objects. Also, results of experiments by other researchers during the period between Newton and Einstein showed light having wave-like properties, which made them conclude that light was energy, instead of matter. Light passing through the glass slab encounters refraction two times once at air to glass interface and other at glass to air interface. And as you mentioned you are stepping into Class 11, we do have video lectures and notes for each and every subject. The fixed value of the speed of light in SI units results from the fact that the meter is now defined in terms of the speed of light. When light (incident ray) travels from air to glass slab i.e. Similarly, when we compare water and kerosene, kerosene is optically denser(1.44) than water(1.33). The radius of curvature of a spherical mirror is denoted by letter ‘R’. Super notes. Parallel rays that are not parallel to the main axis gather at a point (such as F1)on the focal plane. Rosen, 2013. Thus A' is the virtual image of the point A. Light is a transverse, electromagnetic wave that can be seen by the typical human. In the figure i is the angle of incidence, r is the angle of refraction and e is the angle of emergence. E.g., Moon, tree, table, painting. Einstein then proposed that light is actually made up of tiny packets of energy that travel or propagate in a wave-like manner. Refraction is a phenomenon of bending of light when it travels from one medium to another. Lateral displacement is the distance between the original path of the incident ray and emergent ray. Glass, for example, is transparent to all visible light. To put it simply, light is a type of radiant energy that we are able to visually perceive with our eyes. Pole is generally represented by ‘P’. A plane mirror is a flat mirror that is usually made of glass with a very thin layer of silver on the back. By using concave mirror in solar furnace the concentrated rays of sunlight is obtained at focus which produces enormous amount of heat because of concentration. Properties of image: Image is highly diminished, virtual and erect. It is represented by the letter C. In the case of concave mirror centre of curvature lies in front of the reflecting surface. m = checkTime(m); Substances which transmit most of the light and only absorb or reflect a little bit are called transparent. Of course it does! Normal- Normal is a line perpendicular to mirror drawn at point of incidence. Similarly, all rays parallel to the principal axis of a convex mirror appear to diverge or coming from principal focus after reflection from a convex mirror. This law is also known as Snell’s law of refraction. Find out how children learn about light and how you can support your child's science learning at home in primary-school teacher Catherine Casey's guide for parents. In other words, light is power that we can see! Subscribe to our mailing list and get interesting stuff and updates to your email inbox. Each of these surfaces forms a part of a sphere. The particle he conceived was a photon, and he speculated that when electrons within matter collides with photons, the former takes the latter’s energy and flies out. It is erect and of size equal to that of the object. In other words, the vertical plane in which the focal point lies is the focal plane. Angle of incidence- Angle between incident ray and normal. Why Is It So Special? (f) Aperture: The effective diameter of the circular outline of a spherical lens is called its aperture. Pole lies on the surface of spherical mirror. The heat produced due to the concentration of sunlight ignites the paper. This is the image of the object. The Science of Vision and Light. source: Everette Historical/ shutterstock.com. The light ray may be objects self-light or reflected light. Convex mirror is used in rear view mirror of vehicles so that the driver can see the traffic coming from behind.

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