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www.GOALias.blogspot.comBoojho noted in his notebook: Isit not surprising that my image isof the same size as me whetherthe mirror is small or large?Was the image upright in each case?Did the flame appear on top of the candleas in the object? Such an image is callederect. An image formed by a planemirror is erect and of the same size asthe object.Now place a vertical screen behindthe mirror. Try to obtain the image ofthe candle on this screen. Can you getthe image on the screen? Now place thescreen in front of the mirror. Can youget the image on the screen now? Youwill find that the image of the candlecannot be obtained on the screen ineither case.What about the distance of the imagefrom mirror? Let us perform anotheractivity.Activity 15.3Take a chess board. If a chess board isnot available, draw on a chart paper 64(88) squares of equal size. Draw a thickline in the middle of the paper. Fix aplane mirror vertically on this line. Placeany small object, such as a pencilsharpner, at the boundary of the thirdsquare counting from the mirror(Fig. 15.7). Note the position of theimage. Now shift the object to theboundary of the fourth square. Againnote the position of the image. Did youfind any relation between the distanceof the image from the mirror and that ofthe object in front of it?Fig. 15.7 Locating image in a plane mirrorPaheli made a note in her notebook:In a plane mirror the image isformed behind the mirror. It is erect,of the same size and is at the samedistance from the mirror as theobject is in front of it.You will find that the imageis at the same distance behindthe mirror as the object is in frontof it. Now verify this by placingthe object anywhere on the chartpaper.177LIGHT177