When viewed in a standard vertical plane mirror, which of the following capital English letters remains completely unchanged in visual appearance?
Options:
(A) B
(B) M
(C) E
(D) P
Answer Key:
B
Step-by-Step Solution & Explanation
A vertical plane mirror produces lateral inversion (reversal along the horizontal axis). Only figures and letters possessing vertical bilateral symmetry remain invariant upon lateral inversion. Among the choices:
• 'M' possesses a vertical line of symmetry, so its mirror image is identical to itself.
• 'B', 'E', and 'P' lack vertical line symmetry and appear horizontally inverted.