please solve question 7and8.
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u=15 cm
v=10cm
we have
1/f=1/u +1/v
ie 1/f=1/15 + 1/10
1/f=3+2/30
1/f=5/30
f=30/5
f=6cm
thus, f=6cm ans
v=10cm
we have
1/f=1/u +1/v
ie 1/f=1/15 + 1/10
1/f=3+2/30
1/f=5/30
f=30/5
f=6cm
thus, f=6cm ans
sanskar3289:
you take u = 15cm but u= always -ve
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