WAEC 2011 Physics · Question 38

Which of the following statements about the image formed by a plane mirror is not correct?

Options

  1. A.it is laterally inverted
  2. B.it has unit magnifiation
  3. C.it is formed by actual intersection of rays
  4. 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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