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Respect (73%):
Date Posted: 7/24/2008 6:07:23 PM  Status: Live
mirrors!!
Course Textbook Chapter Problem
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Question Details:

A person 1.59 m tall wants to be able to see her full image in a plane mirror.

(a) What must be the minimum height of the mirror?

     

(b) How far above the floor should the bottom of the mirror be placed, assuming that the top of the persons head is 14.7 cm above her eyes?

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Answers:

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Date Posted: 7/24/2008 8:04:50 PM  Status: Live
Asker's Rating: Lifesaver   
Response:
For a plane mirror, the minimum height to present a full image is equal to 1/2 the height of the object. 

a) Minimum Height = (0.5)(159 cm) = 79.5 cm

b) The top of the mirror must be 7.35 cm below the top of the person's head.  If the person is 159 cm tall, the top of the mirror must be placed at 151.65 cm.  This means that the bottom of the mirror must be placed at 72.15 cm from the floor.




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