Depending on the type of matter it comes into contact with, light will behave differently. Unlike other sites , this site gives covers every single topics and very simple, easily understanding and detailed summary. The incident ray, the refracted ray and the normal to the interface of two transparent media at the point of incidence, all lie in the same plane. Rules for image formation by diverging lenses. Thus, B 'is the virtual image of the point B. The principal axis of the mirror is taken as the X-axis(X’X) of the coordinate system. Sign convention for lens is similar to that of spherical mirror. This spot of light is the image of the Sun on the sheet of paper. var s = now.getSeconds(); What Is The Fibonacci Sequence? CLICK HERE to watch them. For this notes thank you. In other words, when an object is placed in front of the plane mirror, sides are reversed. The idea that light may be a particle was first advocated by Sir Issac Newton, but the idea didnât catch on particularly well until the 19th century, when Albert Einstein revived the view. i)Object at infinity: When the object is at the infinity, a point sized image is formed at principal focus behind the convex mirror. Two rays(AP and AQ) starting from A, incident on the mirror gets reflected as PP' and QQ' respectively from the mirror. Young performed the single-slit experiment, which was instrumental in establishing the wave-like properties of light, such as interference and diffraction. "Lateral inversion" means the apparent reversal of the mirror image's left and right when compared with the object. (i) Concave Lens :- The principle focus of a concave lens is a point on its principle axis from which light rays, originally parallel to the axis, appears to diverge after passing through the lens has a virtual focus represented by letter F’. Thanku dron study for easy notes in easy language, Best ever notes of science, notes are detailed ones .each word is easy to understand. In other words, light is power that we can see! What Is Light Energy? Light is a form of energy, which induces the sensation of vision in our eyes and makes us able to see various things present in our surrounding. if (i < 10) { Non-luminous objects are objects which reflect light from other sources. Above expression gives the refractive index of medium 2 with respect to medium 1. Our Sun is the closest star … Thus, height of an object and that of an erect image are positive and all distances measured below the principal axis are negative. document.write(''); Humans need light to see and go about daily activities. A number of scientists, including Fresnel, Young and Maxwell, are credited with investigating the wave-like properties of light. Description of all topics are easy and good, Thankyou dronstudy i luv u.........u r my best link ever i got. Normal- Normal is a line perpendicular to mirror drawn at point of incidence. When light (incident ray) travels from air to glass slab i.e. In the case of convex mirror: A ray directed towards principal focus goes parallel to principal axis after reflecting from the surface of a convex mirror. She also identifies herself as a bibliophile and a harry potter fanatic. The distance of this image from the position of the mirror gives the approximate value of focal length of the mirror. 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. Pole lies on the surface of spherical mirror. It consists of photons that travel in a wave like pattern. s = checkTime(s); If light ray is incident perpendicularly to an interface, it does not bend. The heat produced due to the concentration of sunlight ignites the paper. Light is both a particle and a wave. Using the same method as the single slit, the only modification is that the screen with the slit now has two parallel slits and light behavior is again observed on the screen placed behind the double-slit plate. Science of Light. Why Is It So Special? (e) Optical centre: The central point of a lens is called its Optical Centre. Magnification is the ratio of the height of the image to the height of the object. Distinguishing between the 3 types of mirrors, When we stand in front of the mirror, then the image. Our first stop is the ancient world, where some of the earliest scientists and philosophers pondered the true nature of this mysterious substance that stimulates sight and makes things visible. An infinitely large, real and inverted image is formed at infinity when object is placed at principal focus, F1 of a convex lens. The angles of the incident and reflected rays are always measured from the normal. Better notes thanks to help my study i really really Thank you. This is the image of the object. Magnification produced by a spherical mirror gives the relative extent to which the image of an object is magnified with respect to the object size. Absolute refractive index of some material media. v)Principal Axis: Imaginary line passing through the centre of curvature and pole of a spherical mirror is called the Principal Axis. (By definition of the focus), • A ray through the focus or directed towards the focus(F’), after refraction from the lens, becomes parallel to the principal axis. Light is a form of energy, which induces the sensation of vision in our eyes and makes us able to see various things present in our surrounding. A positive sign in the value of the magnification indicates that the image is virtual. These lenses are thicker at the centre and thinner at the ends. Distance of object and image is measure from the optical centre of the lens. The refractive index is a relative value of speed of light in the given pair of media. This sphere has a centre. It's too lengthy notes for me 'NCERT suppose to write books and we suppose to write notes ', Very useful notes. It will be a different comment for u sir/madam. For centuries, this mysterious and elusive phenomenon left scientists baffled because with each experiment conducted to define its nature, it seemed to change the way it behaved. Message *I was searching this notes for a long time but finally I got this notes . Image is seen at I, ii)Distance of object from mirror = Distance of image from the mirror. Such a reflection is known as diffuse reflection or irregular reflection . A wave is a transfer of energy from one point to another without the transfer of material between the two points. Only reflection notes are here please give refraction also. Similarly, Shiny/smooth surfaces reflects more light whereas dull/rough surfaces reflects less light. It is represented by the letter C. In the case of concave mirror centre of curvature lies in front of the reflecting surface. The middle point of the mirror is called pole of the mirror. Focal length of a lens is half of the radius of curvature. d) Letters beneath slab seems to be raised due to refraction. 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. 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.
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