Question

a convex mirror has a focal length of 18cm the image of an object kept in front of the mirroris half the height of object wha t is the distance of object from mirror

Answer 1

f=18
O=x cm (let)
I= x/2 cm
we have,
I/O=v/u
or, x/2x= v/u
v= u/2
again,
1/f=1/u+1/v
1/18= 1/u+2/u
u=54cm Ans#

Answer 2

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