Question

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

Answer 1

Answer:

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#