Question

Magnification is 3 object distance is 16 what is foval length

Answer 1

m=3cm

u=16

f=?

m=-v/u

-v/u=m

-v=m×u

-v=3×16

-v=48cm

1/f=1/v+1/u

=1/48-1/16

=1-3/48

=-2/48

1/f=-2/48

f=48/-2

f= -24cm

hope this may help you

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