RAS question
What will be the mirror image of the letter 'E' when a mirror is placed on the right side?
Correct answer: (D) The letter appears reversed left-to-right (horizontal flip).
When a mirror is placed on the right side of the letter E, its mirror image is a left-to-right reversal, or horizontal flip, of E.
Explanation
A mirror on the right side acts like a plane mirror for this visual-reasoning question. NCERT states that the image formed by a plane mirror is laterally inverted, which means the left and right sides are interchanged while the image remains erect. For the capital letter E, that left-right reversal changes the direction in which the three horizontal strokes point. In the mirror image, they point leftwards instead of rightwards, so the letter looks like a reversed E. Nothing in this setup requires turning the letter through an angle or flipping it from top to bottom; the operative change is lateral inversion.
Why the other options are wrong
- (A) A right-side mirror produces lateral inversion, not a 90-degree rotation of the letter.
- (B) An upside-down E would be a vertical flip, whereas a plane mirror on the side interchanges left and right.
- (C) The letter E is not unchanged because lateral inversion reverses the side on which its horizontal strokes appear.
Concept
This tests mirror-image reasoning under visual reasoning in Reasoning and Mental Ability. It recurs in RAS because such questions check whether the candidate can apply lateral inversion quickly without confusing it with rotation or vertical flipping.
