the real image of an object placed at a distance of 20cm from a concave Mirror infront of it, is formed at distance of 30cm from the mirror. find the focal length of the mirror. [answer is 12cm I just want the correct solution]
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Answer:
f=-12cm here "-" sign indicates focal length should be measured left side of the mirror
Explanation:
given u= -20cm , V = -30cm, f=?
by using mirror formula 1/f= 1/u+1/v
we will get f=-12cm
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