A six feet tall lady wants to see her full image in a plane mirror . The minimum length of the mirror will be ?
Correct answer: D. 3 feet
- A. 6 feet
- B. 12 feet
- C. 4 feet
- D. 3 feet
- E. None of these
Explanation
A plane mirror only needs to be half as tall as the observer for the observer to see the complete body, because rays from the head and feet reach the mirror at halfway points. For a six-foot person, the minimum mirror length is therefore three feet.
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