Question

A convex lengths of focal length of 18 cm . The image of an object kept in front of the mirror is half the height of the object .What is the disatance of the object from the mirror​

Answer 1

Answer:

F=18cm

hi= ho/2

hi/hO=1/2 (eq 1)

u=?

using magnification formula we have

hi/ho= - v/u

v= -u ×hi /ho=u/2 using (1)

now using mirror formula we have

1/f= 1/v+1/u

1/18 = -2/u +1/u

u= -18 cm

Hence , the distance of the object from the mirror is 18 cm

Answer 2

Answer:

1f=1v+1u where f is the focal length of the mirror. Thus object is placed at distance 18 cm to the left of the mirror. Or, v=9cm.

Explanation:

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