Imagine+that+a+spherical+mirror+gives+an+image+magnified+5+times+at+a++distance+5m.if+so+determine+whether+the+mirror+is+concave+or+convex+.how+much+will+be+the+focal+length+of+the+mirror
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By magnification u can get v/u ratio.
Then find u as v is given.
Put it in mirrors formula which is
1/f = 1/v + 1/u
You'll get yoir answer.
Hope it helps
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