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www.GOALias.blogspot.comFig. 15.15 Real images formed by a concave mirror15cm10cm). This will act as a screen.Keep a lighted candle on the table at adistance of about 50 cm from the mirror.Try to obtain the image of the flame onthe screen. For this, move the screen tilla sharp image of the flame is obtained.Make sure that, the screen does notFig. 15.16 Virtual image formed by a concavemirrorobstruct the light from the candle fallingon the mirror. Is this image real orvirtual? Is it of the same size as the flame?Now move the candle towards themirror and place it at different distancesfrom it. In each case try to obtain theimage on the screen. Record yourobservation in Table 15.1. Is it possibleto obtain the image on the screen whenthe candle is too close to the mirror(Fig. 15.16)?We see that the image formed by aconcave mirror can be smaller or largerin size than the object. The image mayalso be real or virtual.Concave mirrors are used for manypurposes. You might have seen doctorsusing concave mirrors for examiningeyes, ears, nose and throat. Concavemirrors are also used by dentiststo see an enlarged image of the teeth(Fig. 15.17). The reflectors of torches,headlights of cars and scooters areconcave in shape (Fig. 15.18).181LIGHT181