Answers

2015-12-05T18:14:48+05:30
H1=4cm
h2=?
f=12
u=20cm
1/v-1/u=1/f
i/v=1/12=1/20
v=54
0
i think there is mistake in ur calculation as i got v=30
K. I wll see to it. thanks anyways.
okay
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2015-12-05T20:22:48+05:30