a student has three concave mirror A,BandC of focal length 20cm,15cm and 10 cm respectively. for each concave mirror he performs the experiment of image formation for three values of object distances of 30 cm,10 cm and 20 cm. then for three object distances, identify the mirror which will form an image equal in size to that of object.find at least one value of object distance
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f15and u30;f10and u20
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