A person 1.8m tall stands 0.75m from a reflecting globe in a garden. PART A If the diameter of the globe is 16cm , where is the image of the person, relative to the surface of the globe?
PART B How large is the person's image?

1. The image of the person is 1.41 m, virtual and formed at the back of the surface of the globe.

2. The person's image is 3.38 m tall.

Explanation:

From the given question, object distance, u = 0.75 m, object height = 1.8 m, radius of curvature of the reflecting globe, r = 8 cm = 0.08 m.

f = = = 0.04 m

1. The image distance, v, can be determined by applying mirror formula:

= +

= +

- =

=

  = -

⇒ v = -

      = - 1.41 m

The image of the person is 1.41 m, virtual and formed at the back of the surface of the globe.

2.   =

  =

v =

  = 3.384

v = 3.38 m

The person's image is 3.38 m tall.

force required to detach it is given by

charges are taken to be fundamental charge

now we have

so above is the minimum distance at which it will detach