10th science.rtf

Mob 9017557576 Er.Akshay Sharma’s ADVANCE STUDY MATERIAL Chapter -10 Light: Reflectio a! Refractio Refection of light :- when a ray of light falls on a polished smooth surface such as mirror it return back into the same medium. Th
of 8
All materials on our website are shared by users. If you have any questions about copyright issues, please report us to resolve them. We are always happy to assist you.
Related Documents
    Mob 9017557576  Er.AkshaySharma’s ADVANCE STUDY MATERIAL   Chapter -10   Light: Reflectio a! Refractio    Refection o light    :- when a ray of light falls on a polished smooth surface such as mirror it return back into the same medium. This is called reection of light . Laws o refection  The incident ray, the normal to the mirror at the point of incidenceand reected ray, all lie in the same plane.Image formed by a plane mirror is always virtual and erect. The size of the image is eual to that of the ob!ect. The image formed is as far behind the mirror as the ob!ect is ii front it. Two type of spherical mirrorI. oncave mirrorII. onve# mirror I.Concave mirror  :- a spherical mirror whose reecting surface is curved inwards, face towards the centre of sphere is called concave mirror. It mostly forms real image. It converges the rays of light.  Convex mirror:-a spherical mirror whose refecting suraceis curved outwards is called convex mirror. It always ormsvirtual image. It diverges the rays o light. #e$ ter%& i &pherical %irror II.Pole:-   the centre of the reecting surface of a spherical mirroris a point called pole. $nd represented by %. Centre o curvature:-  The reecting surface of a sphericalmirror forms a part of a sphere. The centre of this sphere iscalled centre of curvature. &enoted by . Radius o curvature:-   the radius of the sphere of which thereecting surface of a spherical mirror forms a part is calledradius of curvature. $nd represented by '. Principal axis:- $n imaginary straight line passing through thepole and centre of curvature of a spherical mirror is calledprincipal a#is. Principal ocus:-  The rays of light coming parallel a#is, afterreection from the concave mirror meet at a point on theprincipal a#is, this point is called  principal. ocal   length:-  Thedistance between the focus and the pole of the mirror is calledfocal length. ocal length :-  The distance between the focus and the pole of the mirror is called focal length. !se o concave mirror:- I. oncave mirrors are commonly used in torches, search-lights and vehicles headlights to get powerful parallelbeams of light.  II.It is often used as shaving mirrors to see a larger image of the face.III.The dentists use concave mirrors to see large image of teeth of patients.I(.)arge concave mirrors are used to concentrate sunlight toproduce heat in solar furnaces. !se o Convex mirror  I. onve# mirror are commonly used as rear-view mirrors invehicles.II.It enables the driver to see tra*c behind him to facilitatesafe driving.III. onve# mirrors preferred because they always give anerect, though diminished, imageI(.They have a wider +eld of view as they are curvedoutwards.$ll this will not possible with a concave or plane mirror. ew Cartesian sign convention or mirror I.The ob!ect is always placed to the left of mirror.II.$ll distances parallel measured to the right of the srcin along # a#is are taken as positive while those measured to the left of the srcin along /# a#is are taken as negative.III.&istances measured perpendicular to and above the  principal a#is along y a#is are taken as positive.I(.$ll distance parallel to the principal a#is are measured from the pole of the mirror.(.&istance measured perpendicular to and below the principala#is along /y a#is are taken as negative.(I.The pole of mirror is taken as origin.(II.The principal a#is of the mirror is taken as #-a#is....  Mirror for%'la a! %agificatio  There is a relationship between v,u and f which is e#pressedas  ⅟v+⅟u=⅟f where   u0 ob!ect distance,   v0image distance, f0focal length, Magificatio:- it is e#pressed as the ratio of height of the image to the heightof the ob!ect. It is usually represented by m.m0height of the image h12height of the ob!ecth3agni+cation m 0h12h0-v2u4eight of the ob!ect is taken to be positive as the ob!ect isusually placed above the principal a#is. The height of theimage should be taken as positive for virtual images. $nd it isnegative for real images.$ negative sign in magni+cation shows that image is real. $ndpositive sign shows that image is virtual.
We Need Your Support
Thank you for visiting our website and your interest in our free products and services. We are nonprofit website to share and download documents. To the running of this website, we need your help to support us.

Thanks to everyone for your continued support.

No, Thanks