the real image of an object placed at a distance of 20 cm from a concave mirror infront of it, is formed at distance of 30 cm from the mirror. find the focal length of thr mirror
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formula 1/v +1/u =1/f
u=20
v=30
so, f=12 answer
u=20
v=30
so, f=12 answer
kAbirtiwari:
ryt..
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