Question

At what distance from a convex mirror of focal length
25 m should a boy stand so that his image has a height
equal to half the original height ? The principal axis is
perpendicular to the height.

Answer 1

Answer:

Magnification=height of the image/height of the object=-image distance/object distance

Let the actual height be x

=

x

(

2

x

)

=

2

1

2

1

=

u

−v

Usingsignconverstion,

2

1

=

u

v

u=2v

Explanation:

and the answer is 2.5