Determine the minimum size of a mirror that a lady 1.2m tall will buy to be able to see her full height if her eyes are placed 6cm from the top of her head

To determine the minimum size of a mirror that a lady 1.2m tall will need to see her full height, we need to consider the following:

1. The height of the lady: 1.2 meters
2. The distance of her eyes from the top of her head: 6 cm

To see her full height, the lady needs to be able to see her entire body, including her head. This means the minimum height of the mirror should be at least equal to her total height.

Height of the mirror = Lady's height

Next, we need to consider the position of her eyes. Since her eyes are placed 6 cm from the top of her head, this means that the mirror needs to be tall enough to accommodate her eyes as well. Therefore, we need to add the distance from her eyes to the top of her head to the minimum height of the mirror.

Minimum height of the mirror = Lady's height + Distance from eyes to top of head

Now, let's calculate the minimum size of the mirror:

Height of the mirror = 1.2m + 0.06m
= 1.26 meters

Therefore, the lady will need to buy a mirror that is at least 1.26 meters tall in order to see her full height when her eyes are placed 6 cm from the top of her head.