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tn object 1 cm tall is placed 30 cm in front of a convex mirror of focal length 20 cm. Find the size andposition of the ex mirror./image formed by the conv |
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Answer» u= -30cm f= +20cm ho= +1cm Using mirror formula, 1/v+1/u=1/f 1/v+1/-30=1/20 1/v-1/30=1/20 1/v=1/20+1/30 1/v=3+2/60 1/v=5/60=1/12 =>v= +12cm Therefore, the image will be formed at a distance of 12cm behind the mirror. m= -v/u m= -12/-30 m= +0.4 m=hi/ho 0.4=hi/ho 0.4=hi/1 =>hi= +0.4cm Therefore, the image formed is diminished in size. |
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