real & virtual image u= 10 cm v = 20 cm hi = 7 cm ho = ? f = ?
please give answer.....
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Step-by-step explanation:
given, u=10cm,v=20cmh=7cm
find f
now,
F=1/v+1/u
F=1/20+1/10
F=(1+2)/20
F=3/20 ans.
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