at what distance an object is placed from a concave mirror of focal length 36cm to form an image 1/4th of the size of the object
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m=v/u=1/4 or -1/4
1/v-1/u=1/f
4/u-1/u=1/-36 or -4/u-1/u=1/f
u=-108 or u=180
1/v-1/u=1/f
4/u-1/u=1/-36 or -4/u-1/u=1/f
u=-108 or u=180
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