A person is 1.4 m tall, and is standing at 2.0 m in front of a plane mirror. Wha
ID: 1344337 • Letter: A
Question
A person is 1.4 m tall, and is standing at 2.0 m in front of a plane mirror. What is the minimum length of the mirror that is needed so that the person can see her full height?Tries 0/12 What is the minimum length of the mirror if the person is now 3.5 m from the mirror? A person is 1.4 m tall, and is standing at 2.0 m in front of a plane mirror. What is the minimum length of the mirror that is needed so that the person can see her full height?
Tries 0/12 What is the minimum length of the mirror if the person is now 3.5 m from the mirror? Tries 0/12
Explanation / Answer
the height of the person is 1.4 m
The bottom of the mirror will need to be at 1/2 eye height from the floor
Ht = 1.42 = 0.7 metre from the floor.
a) 1.4 - 0.7 = 0.7m. tall mirror, mounted 0.7m. from floor.
b) No different. Only angles of incidence and reflection change.
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