Question

Can You Solve Question 32 ?
it is urgent

Answer 1

initially
u=-15cm

1/v+1/u=1/f
1/(-15) +1/u=1/(-f)
let initial magnification=m =-v/u
m=-v/(-15)
v=15m
now ,
1/15 -1/15m=1/f--------(2)

finally
u=-9cm
1/(-9) +1/(v)=1/(-f)

magnification =3m=-v/u
v=27m

now ,

1/9 -1/27m =1/f -----------(2)

solve equation (1) and (2)
f=-6cm

Answer 2

Explanation:

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