Thread: mirror height

1. mirror height

A person whose eyes are 1.70 m above the floor stands in front of a plane mirror. The top of her head is 0.15 m above her eyes.

(a) What is the height of the shortest mirror in which she can see her entire image?
m

(b) How far above the floor should the bottom edge of the mirror be placed?
m

need help, please help by showing the setup or work this one out please.

2. Originally Posted by rcmango
A person whose eyes are 1.70 m above the floor stands in front of a plane mirror. The top of her head is 0.15 m above her eyes.

(a) What is the height of the shortest mirror in which she can see her entire image?
m

(b) How far above the floor should the bottom edge of the mirror be placed?
m
I've attached a sketch.

You will easily see that the minimum length of the mirror must be 0.925 m and
that the bottom edge of the mirror must be placed 0.85 m above the floor.

You also will see that the distance from the mirror doesn't matter.

3. Thanks for the diagram, it makes it so much easier to see when its looked at that way.

find the hieght above the floor og the top and bottom of the shotest mirror

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