WAEC 2011 Physics · Question 38
Which of the following statements about the image formed by a plane mirror is not correct?
Options
- A.it is laterally inverted
- B.it has unit magnifiation
- C.it is formed by actual intersection of rays
- D.its distance from the mirror is equal to that of the object from the mirror
Answer: C. it is formed by actual intersection of rays
Explanation written with AI and checked against the answer key
Analyze the question: We need the statement about a plane mirror image that is not correct (the false one).
Concept: A plane mirror forms a virtual, upright, laterally inverted image. The image is the same size as the object, and it is as far behind the mirror as the object is in front.
Checking each option:
- A. It is laterally inverted. True. Left and right appear swapped (that is why "AMBULANCE" is written reversed on the front of vehicles).
- B. It has unit magnification. True. Image size = object size, so magnification = 1.
- C. It is formed by actual intersection of rays. False. In a plane mirror, the reflected rays diverge. They only appear to come from a point behind the mirror, found by extending them backwards. That makes the image virtual, formed by the apparent intersection of rays, and it cannot be caught on a screen. A real image is the one formed by actual intersection of rays.
- D. Its distance from the mirror equals that of the object. True. Image distance = object distance.
Answer: The statement that is not correct is C.
Tip: Remember "plane mirror = virtual, upright, same size, same distance, laterally inverted." Whenever you see "actual intersection of rays" in a plane mirror question, it is almost certainly the false statement, because actual intersection means a real image.
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